How about including a reset button (in addition to go and stop)?
When working with pupils I always encourage using Go (or in Scratch - Green flag) to reset all sprites to their starting position/direction/size etc
And then I get them to use "when space key pressed" to run their program.
In my experience, this makes it a lot easier to debug (for both teacher and pupil) as it separates out the initial starting conditions from the running program
So I'm thinking - why not have an explicit reset button that broadcasts "reset"?
Reset Button
Moderator: MSandro