In the lobby
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#Kicking or banning people from your game. Including spectators.
As it is today you can only kick non spectators.
#An option that restricts who you can give units to so that you can only give away units to your allies.
Specifically to stop people who generally whine alot and then give away their base to the enemy the second they get attacked.

#Visible checkboxes for the following settings in the lobby before starting the game:
Maxspeed, Minspeed & pause locked and only usable ingame by the host. - To prevent people from messing with the speed and thus desyncing the game. (there are actually people out there who think its fun to do...)
Disable Cheats - Stop cheaters.
In game
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#A way for the host to kick people from the game after it started.
This is really needed so that you can get rid of insane spammers, people who are causing desyncs etc.
Hope this post can inspire some positive changes to the lobby and the game in general.