It's been a while, so my memory might be faulty. Can't you drag/assign them to number keys?
I'm pretty sure you can. Though much of the interface got dumbed down for the PC sequel, I think they left that alone. But whomever decided to remove keyboard shortcuts to your codex or you quest log is an idiot.
One thing I'm kinda disappointed about. I don't intend to play through this game 6 times, one for every class, and I want force powers, sniper rifles, grenades, cloak, the works, but I can't have it. The leveling trees seem pretty limited for all classes.
If I remember correctly you get to pick one of your squad members special abilities for yourself after you beat it once. I would always take one of the force powers on my infiltrator. Also, you get to pick up another weapon skill somewhere along in the story I think.