We just discovered last night that any player in a game can boot other players. Some guy was abusing it during our weekly playdate so we canceled it and promptly released the patch that night. This update also fixes the issue where you couldn't increase your sniper zoom level if you were using Hold to Zoom controls. Now you just press the "Special Alt Fire" key, which by default is the Alt key. Note this won't work in MapMaking Mode where Alt changes your sniper's destruction/creation radius.
The booting problem doesn't exist on Xbox, but the zoom fix plus the player options from PC Update 17 should be out on Xbox in a few days once it gets through peer review.