I feel there's plenty of ways to thank those players - and to be honest players that will go out of their way to do that aren't seeking any particular reward. (In the case of Fishers we're all suffering through the same hell)

It would be nice to be able to pass commendations outside of dungeons to players that have helped us out - though at the same time they probably wouldn't because people would start "buying commendations" and other such nonsense, and it would become largely meaningless. That said I'd still like to see some incentivization towards getting the community to help out other players.