Personally, now that I'm starting to play DPS more (mainly a healer), I wouldn't mind an end-of-encounter window that shows what the DPS was for just the DPS in the group. Doesn't need to show the class/job, or the names, just the scores and which one's mine.

Maybe not even scores, just a pop up saying where I stood compared to the other 3-4 dps in my party. Then I can just strive not to be in 4th/5th place. (or maybe that plus just my own dps score)