Okay I thought it would be a cool idea to have 'blitz' 2 player games where you had 10 minutes for each turn. This would be great for people who like playing quick games (like me). The Blitz Games would be like a seperate account with different scores or something - it would be surprising what different skills the fast and slow game take :p.
I'd say that it would be far too much of a hassle, coding and otherwise, to keep separate scores. Anyway, you can (unofficially) do this so it just seems like a big waste of time.
I like it, but 10 minutes seems too short of time. For example, on World 2.1, the sets are up too 100. Most people would probably take more than 10 minutes on that turn.