As others have said, it would invalidate the whole system if you were to be able to comm someone simply on the merit that they comm'd you. So no.
I'd be fine with seeing who my commendations are from - after the instance is over and everyone's already comm'd/or not. And since if you go in with a premade you can't comm, the comms are only from DF randoms who are probably not on your server and 999/1000 you'll never see them again. Couple that with the fact that it would probably take a bit of effort to implement and, no, sorry I'll pass. It's not worth it.
As for the comm all suggestion, I like it in principle, but there has to be some disincentive or else there's no reason NOT to comm all every run, which inflates the amount of comms artificially and also makes the achievements rather worthless. Also, what if 3/4 did really awesome to make up for that one bad? He gets the comms too and now he has a ton of comms hiding the fact that he's a bad. Again, couple these downsides with the implementation energy and it's just not worth it, imho. I've got no problems with the was the comm system works. It's also pretty meaningless as the only thing it earns you is (meh) glamor.