Commendations are fine as they are imo. You can give and get encouragement and be rewarded for being a team player.

For improving DF however, I would prefer to be able to add players of your data center to a special cross-realm list by right clicking their name in the party list. Then, make those friends a priority match in DF so you can bump into them more often. There could be a similar cross-realm blacklist too which gives priority matching to those not on your blacklist.

Oh, and I would love to be able to requeue with a DF group after the "dungeon complete" message. Just make a /newdungeon command which unlocks the DF menu and class changing if everyone agrees. Now that we will be able to queue even roulettes as a premade this could be a fun way to socialize with random people for a little longer.