I like the new WLP feature where you can right click on the chart and place an order. Some of the fields in the order are not configurable, so you have to manually edit them each time you place an order (for example, it always defaults to Market order, and I would like to make the default be a Limit order). Are these fields configurable somewhere (I know the number of shares comes from the Portfolio Simulation settings, and the default account from the Trading Preferences), or could I write my own C# code to interface with the Order window to somehow set these fields? Or even better, is there an API that I could use to write my own enhanced order entry GUI? I realize Active Trader Pro is Fidelity's de-facto advanced interface for manually entering orders, but it requires even more work to enter a trade in ATP, and some trades happen fast so you need quick entry. I also realize WLP was intended more for backtesting, but right now Fidelity lacks a good way to quickly enter trades. Other packages like NinjaTrader have the SuperDOM which makes it much easier to enter trades. I would be willing to write one for WLP if you could point me in the right direction.

Regarding the possibility of interfacing with the Orders window: Fidelity decided not to document the Broker API.

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No. It's just a quick way to get a discretionary order to market.

The programming solution is to create a Strategy and let it generate market, stop, or limit orders for you - it's not just for backtesting.