Is there a way to organize my PSN games on the XMB in an order other than when they were installed? Ideally, i'd like to add links to them within MultiMan, but I don't know if that's even possible.
you can place them in albums (triangle) or modify registory.xml and category_game.xml to alphabetize. even then, I think lower and upper case characters are separated, so you may have to modify the PARAM.SFO like creating a package of just that file for each pkg. if you get an error about no EBOOT.BIN or ICON0.png, ignore it. you don't need them to do this.
ps3tools should have what you need. extracting a pkg can be done with pkgview (just extract the PARAM.SFO). make a pkg should appear in the context menu when highlighting a folder.