I'm sure these have already been mentioned but:

1. Having A Time Limit for Games (or give the option of a "Quick Game" with a time limit and an "Unlimited game" that doesn't.)
2. Giving the none human's an Aeon Style protector OR limiting 1 Aeon per deck
3. An Auction House of sorts for Rare/Epic cards. Let the players feast on their good fortune.

That's it for now. Interesting game