I own the game for my iPod, but would love to buy the Mac-App-Store-version also. A discount would be nice...

Is this even possible with apples policies?

I'm pretty sure it would not be technically possible, but since FFG have chosen not to put out a universal iOS version with no apparent reason whatsoever, I can pretty certainly dismiss the possibility. Let's see if the $1.99 GOO in-app purchases that will no doubt pop up in a short while can at least be acquired for multiple platforms without duplicate fees...