Your post brings up a lot of cpan deficiencies -- management, the inability to fork into the same name-space, etc... I don't have a solution to your problem, I've had the same issues and in the past I've just hostilely forked into a different name-space to get the job done MooseX::Types::DateTime::ButMaintained. In the end, I hope cpan dies and gives way to something like http://github.org which allready supports this functionality and is making headway into Ruby with the ruby-gem autobuild system.
in reply to JETTERO tries to take over Net::IMAP::Simple on PAUSE
I for one vote you get the maintainership you're seeking without any more undue hardship, so long as you keep the already packaged version of this distro so people can find it if you break anything.