One nice thing about minesweeper that I would enjoy having in this game, is that once all that's left to click on are bombs, the game is done without having to mark every bomb.
When I forget and accidentally leave the game running over night, I get a message from Kongregate saying I'm out of memory. That seems to indicate that you have a memory leak somewhere.
Because it would just duplicate an already existing setting... I don't really see any need for that.