1. The 'raindrops' arn't usually due to rain, its because somebody has fell in the water and since the game is only configured for one player, the water shows on your camera.
2. I assume your on about the auto aim feature in the game. Can you not see why this doesn't work? i'm guessing it was purposely disabled to stop people with controllers having an aiming advantage/disadvantage.
3. Sorry, i do not know about LC-MP since i can never get it working either
4. This would occur if your trying to connect to a laggy server, or if your laggy yourself. I'm guessing this would occur if your on a bad wireless and have a lot of packet loss
5. This sometimes happens with the keyboard too. should be easy for the devs to fix this