For both:

 o Add support for sym-links.

For duplink:

 o Check file (directory) permissions before unlinking.

 o Add options to only link files if they have the same uid/gid etc.

 o Add option to output a list of identical files only.

For compressHelp:

 o Frank Thomas writes:

   I think that loading of some help page could be speed up. Why ?  Because
   if you use the same tiff twice in one rtf file they are stored twice in
   the rtfd directory. Ok, the Help.store contains them only once but they
   are extracted twice! All one has to do is parsing the TXT.rtf and
   changing the name of the referenced tiff and remove unreferenced tiffs. I
   tried it by hand, it works. If you save such a rtfd (from Edit) again
   you'll have the same tiff twice again!

 o Write uncompressHelp.