On many occasions I've played a quick game,
closed the window, and only afterwards realized :
"If only I saved that game. I still wanted to review it."
Unfortunately, it's too late, game is gone.

I think it would be cool, if after restart Lizzie would always ask:
"would you like to resume your previous game ?"

To make it work, perhaps just always store a "temp.sgf".
we could enable/disable this feature in the properties file of lizzie.