i think it would be great to have a 'allow rematches only' option in 'my challenge settings'. I enjoy getting rematches from opponents, but i do not enjoy getting games from random people that I've never played before. This function would ensure that you are only getting rematches.
i know...but i accept open invites when i feel like...so do many people. But I do not enjoy being challenge by someone i do not know. I find it a hassle. Im just suggesting that this function COULD be implemented by a person if they desired. Not that it must.