As a side note, I too have accidently started a tourney in peak hours when I never meant too. For the obvious reasons I didn't want to continue and wished I could cancel it out without forfeiting to play later.
As it was, I wanted to do something else like CTTH which was shorter and not as important to me and I had to forfeit to able to do anything else, or I had to play it.
I know once a shot is made this can't happen in a single play tourney for obvious reasons but it would be nice to back out without playing a shot, so you could continue it at a better time of day, for example. Low on the totem pole anyway but thought I'd throw it out there.