I don't think these are really tricks and I'm pretty sure that some of these were even advertised (ex- multiple windows) while some are even in the manual (hard drive replacement).
Anyway, you are somewhat wrong on the game sharing one. It's not EVERYTHING downloaded from the store, but I think it's everything under a certain price or something like that. You could share the Warhawk add-on's, but not Warhawk itself I believe.







