Quote - I'd love to be able define all things unused for say 12 months/2 years and clear them out on a user used basis.

Yes, in principle, that's what I'd like to be able to do. However Poser doesn't log library use so you'd have to wait for a while to collect the statistics. What I'd wish for is a script or stand-alone program that would look through all my scene files (yes, I keep them all) and build a database of everything that I'd actually ever used - possibly with an optional time limit. Then it could offer to delete the unused stuff that I installed purely because I thought it might be a good idea. :)