Forums / Cotonti / Extensions / questions for usability

currently iam working with a solution to add folders to categorys via a combo-box in the edit dialogue of the pfs system. but i hate this solution.

i was wondering how this management of categorys & folders & images made a bit more simpler for the user. i mean ok the folder edit solution is working and is reliable but can confuse the user more and more because i plan to let user create categorys or groups of their folders and images.

should i build a backend for each user where he can manage his/hers images and folders?
creating groups and such.

or play it oldskool and just add an combo box?