A sin bin only works if you can stop the clock otherwise you fake an injury and roll around until the 10 minutes is up. But I like the idea.
I also think if you get sent off you can send on a sub if you have any left. The sent off player still gets suspended etc but if it happens in the first five minutes of a game it doesn?t ruin the game as a spectacle. I think Reg?s would me more likely to issue red cards if they knew the sent off player can be replaced.