I love this game. Can hardly get enough of it to be really transparent.
Other games that pique my interest with specific mechanics that DoD either uses or I would love to see folded in are:
Mage Knight. I really like the single hero who can recruit, as it were. DoD has that covered.
Pathfinder Adventure Card Game. DoD has the same feel and I like that a lot. Actually it has a better feel IMHO. I wonder if Pathfinder borrowed from you, Jack
Delve the Dice Game. A small but excellent pnp. This is where new variants come in. I really like the use of dice in this game. Similar to Claustrophobia. I wonder if there would be a way to fold some dice rolling into DoD? Of course, Pathfinder also employs the use of dice but I think its a bit over the top there. I prefer something a little more elegant, like what I see in Delve.
Bah! I can't remember the fourth game I had in mind I'll come back and update once it occurs to me.
Anyhow, those are some game mechanics I really enjoy. I see DoD as a near perfect game, for me, and would love to increase its variety. As of now, I have played dozens of times and it still has excellent replay ability. Huge.