It would be neat if it was like Adventure Game Studio except less genre-specific. You could make a drop-down box interaction editor for different objects and also have an area to write code for more advanced things.
To define walkable areas/collision points you could import another bitmap...
If your looking to make point-and-click adventure games then AGS is a great program to use
It uses a language similar to C++ but you can also just use the interaction editor for most things (like picking sentences for what you want to happen after a certain event)
It will at least help you...
It would be cool to see an Audiosurf clone on the pandora or at least something similar if only to be used as a visualization for the music player. -Just an idea for people looking for something to develop.