autobundle is very usefull - it will give me a list of all installed modules, so I can check out the README's (and see what is installed). It doesn't actual help with the installation in the case of prerequisites changes, but it was what I did before, and what I may end up with this time.

As mentioned, I've been looking into Module::Install which may or may not be the way. Right now, I'm trying out a loo*ng cpanp i ... command line, and that seems feasible (except for the usual oddities that always shows up and needs digging).