There should be a rateing lock to hide titles with ratings such as nc-17 xxx or what ever rating the users so choose. To make XMM safer for shared PC's Prehaps a managed list for rateings to be locked out.
"Computer games don't effect kids; I mean if Pac-Man affected us as kids, we'd all be running around in darkend rooms, munching magic pills and listening to repetitive electronic music" (Kristian Wilson, Nintendo, Inc 1989
Don't let my parents see mit prons ;) *LOL* I think that's not possible except Ale makes a filter with password... Better would be a second list in my opinion.
In order to achieve what is possible, you have to try the impossible over and over again. Hermann Hesse