From my experience, I can say that EA Studio is optimized to generate profitable EAs (with good backtests). And this is because it uses the MT indicators. All the custom staff that many people think works…in 99% of the cases, doesn’t work.
So adding custom indicators and additional features will only slow down the program which will result in a lower number of strategies when generating the strategies.
What I would suggest you do is to compare your manual strategy with the EAs from EA Studio and see which one would perform better.