Auto-conversion of currency is something I would like as well.

Just an option you can sign up to. Say scrypt -> LTC and sha-256 -> BTC.
Then you can exchange pools holding of whatever altcoin for us at once somewhere,daily or weekly, maybe keep another 1% comission but no other feeds.

You would make money on the conversion, and we would save, and save on withdrawal fees.

For a higher fee you could exchange on demand, but still at market price after you have done the exchange. No risk for you.