> In some older games, Ctrl is used as the fire button. If there is no way 
> to see Ctrl, such game could not be implemented in Squeak. Or any 
> application that wants to map Ctrl to a function.

Exactly. And currently muO does just that, so hiding the Ctrl status 
from the image would simply irreversibly break my own tools.

Please do not do that.

Stef