I first want to say, I absolutely love this addon.. great job! I will never go back to the standard unit frames.
That said, there ARE two things I miss very much about the standard unit frames:
1. Colored level numerals that compare your target's level to your own (e.g. if I'm level 64 and I target a level 66 mob, the "66" would be orange).
2. The gold and silver dragons that wrap around the portrait of elites and rares! There's something about seeing that silver dragon on a rare target that I just miss!
This addon has become vary popular and you can't make everyone happy, but I feel that these features would be an awesome addition to a fantastic addon!