It would be awesome if Scratch would offer a few (Say 5) persistent variables for each game in the users account. With persistent I mean stored on the scratch database. This would enable features such as hi-score tracking.
Offline
There is a difference between persistent values on the server for each project (which is what would be needed for high score, for example), and for each person who plays the program. For each player, a cookie stored on the player's computer may be fine.
For each program, the amount of data to be stored is trivial, but the interface may be more of a problem.
Personally, I think that there are more important issues for the Scratch team to be working on, but this will probably get more attention from them, since they seem to like the idea of multi-computer games, and persistent, shared variables may be essential for that to work.
Offline