An option to pause a player which will not match you with them for some amount of time, for example, an hour. I find that sometimes I don't want to keep playing the same person and the only option I have is to blacklist them. I don't want to block them forever, I just don't want to see them again for a bit.
Hmmm...interesting point. The difficulty would be, I think, that you want a one-hour break. But I want an 8-hour break. And Bob over there wants a 1-day/24-hour break. So, it seems like a hard thing to program...to allow different people to "pause" someone for different lengths of time. (Of course; having even one option would be better than the current situation--where, as you point out, there's no pause at all that's available.)