Yeah, add DNR! That would be 10/10 good for the exchange itself too.
With some of the recent Love and Hate posts lately, the best thing Bittrex could do would be to add a reputable coin with a great future, like DNR. It would also bring in a different community of users to Bittrex, benefiting all coins traded on Bittrex.
I for one would LOVE to have a DNR/USD pairing, and I'm pretty sure I'd be mostly buying DNR for the next 6 months ;-)
A year ago trex was at the top, now other exchange came in with major volume and adding a bunch of trash, yet finally added ZEN showing they are looking at POW coins too, finally. Why not differentiate yourselves by adding POW coins, like DNR and XSH?