I agree with you about giving commendations to people outside of your party, it's a great idea! I've had many people that I enjoyed running a dungeon with, and then I realized I couldn't give them a commendation because I was in a party and not able to do so. My only concern is that I can see something like this being really low on the implementation viewpoint since commendations aren't actually useful for anything major in game. I'm not saying don't implement it, but I also can't see it being changed anytime soon.