This is not as simple as you write it down. Adding an checkbox is easy, but making it work is a different story. As i said, i will have a look into this. Right now my focus is on version 0.9.
Also for a default strategy the most effective I have tried out recently on NASDAQ data was a combination of MACD and RSI (Only trade if both indicators signal a buy and sell if both indicators signal a sell). In the BTC rally of 2013 RSI would have indicated overbought but MACD would have confirmed the rally trend and you wouldn't have missed out on that epic rally. Then when MACD discovered a turn around, RSI would still be overbought and you would sell nearly at the top.
Just wait till you get your hand on version 0.9. With that version you are able to build up a trading strategy yourself. You will be able to combine more indicators resulting into 1 trade signal. Benchmarking can be done, currency data files can be shared. Results can be shared and verified and strategies can be shared and discussed.
And i will remain active and i will keep on adding indicators, exchanges and new coins.
But if you really want something to program yourself you could use the Command Line Trade Bot for this. With this software you can setup the entire logic in the development environment you want. That piece of software offers a interface over the Command Prompt or using a local webserver.