I'm thinking an interface like mtgoxlive in which I can just click buy and sell orders along the price axis on either side of the bid/ask divide. I want a 'clear all' button. I want to set how many units per click. I want to see my buys and sells explode as they are matched on the market. I want to see my average past sell price and my average past buy prices. I want to see my rate of gains in both currencies over time (on the same chart).
A single click could execute a function of a series of buys and sells in 1% doubling increments or set a bouncing window/path.