Controlling my character(s) is a BIG no-no for me. Another pet peeve is Changing the tone of a Roleplay halfway through for example if the Roleplay starts off a light Hearted Comedy and then all of a sudden throwing in Zombies out of the blue (I like zombie Roleplay I'm just making an example) those are the only 2 things that can make me completely walk away from a Roleplay.
Posting reactions for others' characters is violation of the most basic roleplay etiquette I can think of. I could almost excuse it if it's a 1x1 with a trusted friend, who knows where the lines are and what might be acceptable, but aside of that? No. Not even once.