It is ridiculous that I cannot change the slot of a person who joins a game of mine because I can't access them to change their slot through my friends list.
Also, I can't message people, but they can join my game
You can add people to your friendlist manually, you can then change them from their slots after your friends list is refreshed. I believe that will solve your problem (even though I can't see how this thing is happening to you, it's not normal).
Make it Possible To mail people if they are currently in a game hosted by you, evne if your on their blacklist
The hole point of the blacklist is to avoid people you've blacklisted to contact you. For the mail stuff, I believe you can mail pretty much everyone already.
Allow hosts (finally) to simply kick people from their games. (This would be useful in getting rid of trolls/people with 80%+ boot rates/ racists).
Fizzer already answered that he wouldnt add a kick option for hosts in the uservoice. Just blacklist trolls and put prerequisites if you don't want high boot rates in your games.
It seems to me that you're really not a very, how can I say, experienced player. But I guess that's what happens when you allow people to play lotteries at will and get high levels in an easy way. I guess level 47 doesn't mean much now.
This hole thread is useless, you could have found your answers by just reading the forum/wiki or even better, by (really) playing the game and learning by yourself.
Edited 2/2/2016 01:57:50