I'm kinda new to this game and have had a question (though I couldn't find it in the threads already posted), what exactly do all the aiming options provide? I know the arms are for disarms but what about the rest?

Also, I've noticed that there aren't many people active on this game. It may be that there is and I don't notice but it's saddening to see such a great game but with such little activity. If there's a way I could help to get more people I'd be happy to.