I don't even use the four if I'm honest. I'd much rather be able to favourite actual pages such as basecamp, feedback, forums, dev-forums, etc.

It's actually a good idea, just move the little tabs (Home,Inbox,Friends, and Settings) on the playbar just a litte more to the left, and that's enough space for one or two more.

Yea i agree somtimes i find a new fav game but i already have my favs on there so i have to put it on another game i really liked!