I have some stuff on cpan. Sometimes I get random hackers contact me about details, implementation, requests for documentation and features, etc.
That said, whenever I get any suggestions, crits.. I scramble to make the changes or allow the possibility of a change. My turnaround is between a day, and two weeks if it's something particularly tedious.
Maybe I'm just still a noob and my modules are weird and not too many people use them. Maybe more accomplished authors are more jaded or have less time in their hands.
I for one would like to hear more of what should be different or what's messed up. Maybe other authors would like that as well.