THis kick feature is not a good one.  It is more harmful than helpful.  If I have to go pee, or buy equipment, I can be kicked.  Not cool.
If someone is afk for 2 or 3 rounds, sure go kick them.  But if they wont respond for 30 seconds or so...give them a break!  
Someone leaching for a couple rounds is harmless compared to kicking an active player with a multiplier because they didn't see a message, or had to step away for a min.