Taking a look at everything, I played on RCZ long time so I remember all these things. But there are some things which are making me to think. Like:
I had a lot of problems with "mine". There was players on RCZ which was dropping a mine close to turrets and when a Tyrant was coming to us, that mine exploded and blowed all our base.
The flare was more spamming than useful. Make a way to can hold that flare in your hand, for example in darkness maps. You can also drop it. There were a lot of players who were buying flares and dropped on the base, with multi-spam.
Well, that was the things that were disturbing me a lot.
I also was thinking: what do you guys think to make a medic class, which are healing humans? It would be hard for aliens to kill them, but as long as they have something like "adv baslick" to heal them, it's good.
About the medkit, what do you think about a special animation for that? I recommended this to Unvanquished, but they didn't like the idea. I was thinking like when you use the medkit, you could have an animation with your left hand and a syringe. This would be hard if you use a minigun, but meh.