It sounds like what you really want is for the Dependencies to show up on the search.cpan.org page for each distrobution (right next to the "CPAN Testers" or "CPAN Request Tracker" links perhaps)

What people have tried to explain so far is that it's not neccessary for Module authors to do anything new for this to happen. For wellformed Distrobutions, the info is allready in the PREREQ_PM section of Makefile.PL (And for modules whose Makefile.PL isn't wellformed, it would be just as easy to fix that as to do something new). What's needed is for something on the search.cpan.org site to parse the Makefile.PL and surface the list.

The appropriate place to submit suggestions like this is the search.cpan.org feedback form.