Adding more exchanges, since both GOX and Bitstamp seem to have their own unique problems would be good...and we really need stop loss orders.

I couldn't agree more, on both counts

There are multiple concerns with stop orders:

They would need to be executed on these same exchange APIs, and usually lots of stops will be hit when the market goes crazy, which is the same time the APIs usually stop working
The market can move very fast, so if you have a sell-stop-market order then you could get a very bad price. But a sell-stop-limit order could be left behind in a receding market.
Stop orders place some risk onto RTBTC, since a server glitch could fail to send the stops, or the realtime feeds could fail, leading to stops executed after the market has moved past them. Then the users are mad at RTBTC, and mad users are no fun.

But more exchange support poses way less risk than stop orders, and there will be more exchanges supported Soon^TM.