Me too.
I'll just say that I'm pretty sure what you're thinking of, guest, is the right solution. I don't know what Insane Steve's trick is, but I've sent him a PM about it so we don't keep hijacking this thread.
Now, suggestions for the new Cheapo game.
One really important thing is that on the original game if you have several lemmings under the cursor, there's a way to choose whether a new skill is given to a lemming already doing something or to a walker. (At least one level -- 5 Havoc -- depends on this, so it's clearly intended.) I don't know if this is already on Cheapo? If it is, how do you do it?