I'm honored and pleased to be the person who gets to complete ls. This project, begun around when I was born, was slow to turn into anything more than a simple for loop over a dirent. It really took off in the mid and late 80's, when Richard Stallman added numerous features, and the growth has been steady ever since. But, a glance at the man page shows that ls has never quite been complete. It fell to me to finish the job, and I have produced several handy patches to this end:

The only obvious lack now is a -z option, which should make output filenames be NULL terminated for consuption by other programs. I think this would be easy to write, but I've been extermely busy IRL (moving lots of furniture) and didn't get to it. Any takers to write it?

Due to the nature of these patches, they conflict with each other. Here's a combined patch suitable to be applied and tested.

diff -ur orig/coreutils-8.13/src/ls.c coreutils-8.13/src/ls.c
--- orig/coreutils-8.13/src/ls.c    2011-07-28 06:38:27.000000000 -0400
+++ coreutils-8.13/src/ls.c 2012-04-01 12:41:56.835106346 -0400
@@ -270,6 +270,7 @@
 static int format_group_width (gid_t g);
 static void print_long_format (const struct fileinfo *f);
 static void print_many_per_line (void);
+static void print_jam (void);
 static size_t print_name_with_quoting (const struct fileinfo *f,
                                        bool symlink_target,
                                        struct obstack *stack,
@@ -382,6 +383,7 @@
    many_per_line for just names, many per line, sorted vertically.
    horizontal for just names, many per line, sorted horizontally.
    with_commas for just names, many per line, separated by commas.
+   jam to fit in the most information possible.
 
    -l (and other options that imply -l), -1, -C, -x and -m control
    this parameter.  */
@@ -392,7 +394,8 @@
     one_per_line,      /* -1 */
     many_per_line,     /* -C */
     horizontal,            /* -x */
-    with_commas            /* -m */
+    with_commas,       /* -m */
+    jam            /* -j */
   };
 
 static enum format format;
@@ -630,6 +633,11 @@
 
 static bool immediate_dirs;
 
+/* True means when multiple directories are being displayed, combine
+ * their contents as if all in one directory. -e */
+
+static bool entangle_dirs;
+
 /* True means that directories are grouped before files. */
 
 static bool directories_first;
@@ -705,6 +713,10 @@
 
 static bool format_needs_type;
 
+/* Answer "yes" to all prompts. */
+
+static bool yes;
+
 /* An arbitrary limit on the number of bytes in a printed time stamp.
    This is set to a relatively small value to avoid the need to worry
    about denial-of-service attacks on servers that run "ls" on behalf
@@ -804,6 +816,7 @@
   {"escape", no_argument, NULL, 'b'},
   {"directory", no_argument, NULL, 'd'},
   {"dired", no_argument, NULL, 'D'},
+  {"entangle", no_argument, NULL, 'e'},
   {"full-time", no_argument, NULL, FULL_TIME_OPTION},
   {"group-directories-first", no_argument, NULL,
    GROUP_DIRECTORIES_FIRST_OPTION},
@@ -849,12 +862,12 @@
 static char const *const format_args[] =
 {
   "verbose", "long", "commas", "horizontal", "across",
-  "vertical", "single-column", NULL
+  "vertical", "single-column", "jam", NULL
 };
 static enum format const format_types[] =
 {
   long_format, long_format, with_commas, horizontal, horizontal,
-  many_per_line, one_per_line
+  many_per_line, one_per_line, jam
 };
 ARGMATCH_VERIFY (format_args, format_types);
 
@@ -1448,6 +1461,9 @@
       print_dir_name = true;
     }
 
+  if (entangle_dirs)
+      print_current_files ();
+
   if (print_with_color)
     {
       int j;
@@ -1559,6 +1575,7 @@
   print_block_size = false;
   indicator_style = none;
   print_inode = false;
+  yes = false;
   dereference = DEREF_UNDEFINED;
   recursive = false;
   immediate_dirs = false;
@@ -1644,7 +1661,7 @@
     {
       int oi = -1;
       int c = getopt_long (argc, argv,
-                           "abcdfghiklmnopqrstuvw:xABCDFGHI:LNQRST:UXZ1",
+                           "abcdefghijklmnopqrstuvw:xyABCDFGHI:LNQRST:UXZ1",
                            long_options, &oi);
       if (c == -1)
         break;
@@ -1667,6 +1684,10 @@
           immediate_dirs = true;
           break;
 
+   case 'e':
+          entangle_dirs = true;
+     break;
+
         case 'f':
           /* Same as enabling -a -U and disabling -l -s.  */
           ignore_mode = IGNORE_MINIMAL;
@@ -1697,6 +1718,10 @@
           print_inode = true;
           break;
 
+   case 'j':
+     format = jam;
+     break;
+
         case 'k':
           human_output_opts = 0;
           file_output_block_size = output_block_size = 1024;
@@ -1765,6 +1790,10 @@
           format = horizontal;
           break;
 
+   case 'y':
+     yes = true;
+     break;
+
         case 'A':
           if (ignore_mode == IGNORE_DEFAULT)
             ignore_mode = IGNORE_DOT_AND_DOTDOT;
@@ -2510,7 +2539,7 @@
       DEV_INO_PUSH (dir_stat.st_dev, dir_stat.st_ino);
     }
 
-  if (recursive || print_dir_name)
+  if ((recursive || print_dir_name) && ! entangle_dirs)
     {
       if (!first)
         DIRED_PUTCHAR ('\n');
@@ -2526,7 +2555,8 @@
   /* Read the directory entries, and insert the subfiles into the `cwd_file'
      table.  */
 
-  clear_files ();
+  if (! entangle_dirs)
+     clear_files ();
 
   while (1)
     {
@@ -2615,7 +2645,7 @@
       DIRED_PUTCHAR ('\n');
     }
 
-  if (cwd_n_used)
+  if (cwd_n_used && ! entangle_dirs)
     print_current_files ();
 }
 
@@ -3464,6 +3494,10 @@
       print_with_commas ();
       break;
 
+    case jam:
+      print_jam ();
+      break;
+
     case long_format:
       for (i = 0; i < cwd_n_used; i++)
         {
@@ -4418,6 +4452,24 @@
   putchar ('\n');
 }
 
+static void
+print_jam (void)
+{
+  size_t filesno;
+  size_t pos = 0;
+
+  for (filesno = 0; filesno < cwd_n_used; filesno++)
+    {
+      struct fileinfo const *f = sorted_file[filesno];
+      size_t len = length_of_file_name_and_frills (f);
+
+      print_file_name_and_frills (f, pos);
+      pos += len;
+    }
+  putchar ('\n');
+}
+
+
 /* Assuming cursor is at position FROM, indent up to position TO.
    Use a TAB character instead of two or more spaces whenever possible.  */
 
@@ -4627,11 +4679,13 @@
   -D, --dired                generate output designed for Emacs' dired mode\n\
 "), stdout);
       fputs (_("\
+  -e, --entangle             display multiple directory contents as one\n\
   -f                         do not sort, enable -aU, disable -ls --color\n\
   -F, --classify             append indicator (one of */=>@|) to entries\n\
       --file-type            likewise, except do not append `*'\n\
       --format=WORD          across -x, commas -m, horizontal -x, long -l,\n\
                                single-column -1, verbose -l, vertical -C\n\
+                               jam -j\n\
       --full-time            like -l --time-style=full-iso\n\
 "), stdout);
       fputs (_("\
@@ -4667,6 +4721,8 @@
   -i, --inode                print the index number of each file\n\
   -I, --ignore=PATTERN       do not list implied entries matching shell PATTERN\
 \n\
+  -j                         jam output together, makes the most of limited\n\
+                             space on modern systems (cell phones, twitter)\n\
   -k                         like --block-size=1K\n\
 "), stdout);
       fputs (_("\
@@ -4733,6 +4789,7 @@
   -w, --width=COLS           assume screen width instead of current value\n\
   -x                         list entries by lines instead of by columns\n\
   -X                         sort alphabetically by entry extension\n\
+  -y                         answer all questions with \"yes\"\n\
   -Z, --context              print any SELinux security context of each file\n\
   -1                         list one file per line\n\
 "), stdout);

It remains to be seen if multi-option enabled coreutils will be accepted into Debian in time for the next release. Due to some disagreements with the coreutils maintainer, the matter has been referred to the Technical Committee (Flattr me)

Traditionally new ls contributors stop once enough options have been added that they can spell their name, in the best traditions of yellow snow. Once ls -richard -stallman worked, I'm sure RMS moved on other other more pressing concerns. The current maintainer, David MacKenzie, was clearly not done yet, since only ls -david -mack worked. But he was being slow to add these last few features, and ls was very deficient in the realm of spelling my name (ls -o -hss .. srsly?), so I took matter into my own hands in the best tradition of free software.

-e conflict
The technical committee seems to have identified a major problem with your use of -e for entangle: since ls currently lacks the ability to read email, it will need the option to do so, and -e seems like the obvious choice. Fortunately, it looks like ls does not have an -E option either. Thus, it just remains to decide which of entangle or email gets -e, and which one gets the slightly-less-convenient-to-type -E. I don't think that particular matter needs to go to the technical committee, though; I feel confident that Debian's consensus-based decision process can discuss the matter by email and come to an appropriate resolution by, say, April 2013?
Comment by Josh
"email" indeed?
What is "email"? Do you mean that ls should have the ability to read mail? The -M flag is still available.
Comment by Ed
Ooh. Me like.

… and of course the option -z would be used to NUL-terminate lines, instead of using \n. Finally, an alphabetically complete ls command.

Comment by Matthias