No No NO NO NO!.
For one, it's completely stupid. I download a bunch of modules to try them out, then delete 80%++ of them once I find the one I want. Do I have to register and reply back for all 10 modules I might d/l?
What about the fact that I might be at work? Should I have a work email and a home email and an on-the-road email (for my laptop)? That's three times the usage.
For crying out loud, leave CPAN alone!
Don't go borrowing trouble. For programmers, this means Worry only about what you need to implement.
Please remember that I'm crufty and crochety. All opinions are purely mine and all code is untested, unless otherwise specified.