Inner quads seem to be the key to all my knee problems. I have major tracking issues due to imbalance.
I limit loops as well due to them being on my weaker leg. I'm thinking of asking my coach if we can skip loop for the next test and just see if I can get a flip instead. I need loop for my LTS freestyle level, but I don't really care about that...
I would stick to the exercises that the PT gives you- adding your own may counter-act what she is trying to do. If you feel the routine is too easy, you should ask her for more. My PT also has me using a foam roller on my IT band and quads, to help keep the muscles above the knee loose. (I also wear a jumpers knee strap- but I have patellar tendonitis too, so that might not help you, and I mobilize the knee cap with a sink plunger- but that also doesn't sound like an issue related to a sprain, so I wouldn't recommend it, unless you have bad tracking- but ask first.)