Neato
I always wanted to make one of these games, but I'm lazy. This one's really good though.
It is possible to disable right mouse clicking (kind of). You could put a thing that checks to see if the right mouse button has been clicked and say that if it is, you lose. I don't know about anyone else, but if I put this into one frame of flash and then hit the right mouse button, it works:
onEnterFrame = function(){
if(Key.isDown(2)){
trace('a');
}
}
Key.isDown(1) seems to reference the left mouse button.
I don't think this works on Macs though.