It would be nice if Bittrex would add a second coin as a trading pair to all coins. At the moment, Bitcoin is the only trading pair for the vast majority of altcoins.

That means if I want one of the smaller coins, with only Bitcoin as a trading pair, I have to buy Bitcoin at Coinbase, pay a lofty transfer fee and then buy the coins I want. Or, I could buy Litecoin, pay a far smaller transfer fee, and then pay another fee just to buy Bitcoin, and then buy the coins I want.

It would also be nice if Bittrex would take cash from debit or credit card.

I use Bittrex and I do like it. Those are the main improvements I would like to see. I'll have a look at the terms of service later today.