This tool has a lot of potential to bring game designing forward, but it lacks one thing: Keyboard shortcuts. Preferable if they could be configurable as well.
To speed up developement process it is urgent that a shortcut key to run the game is present. Many tools uses F5 or F9 to indicate a program run.
Several tools use G to hide / show the grid.
GE could use R to hide / show regions, and A to hide / show activation scripts.
It would also help a lot if file and edit menu had shortcuts like Ctrl+N to create a new game, Ctrl+O to open a game, and Ctrl+S to save a game.
Another feature that would be very nice is if one could press ESC to hide the latest menu / dialog shown.