Are you sure? I think you need to double check, i couldn't find any position sizing implemented within the platform itself (You have to code it ) and not sure if you can optimize it. I know that feature is there in Trade station optimizer, but also first you need to code them.
I'm not the original poster I just came about this thread by accident and I needed something like this!
Here is one view from a retail perspective: How much % capital in each trade and your risk of ruin depend on your Kelly (positive expectancy). No strategy works if it doesn't have positive expectancy otherwise the position size is zero. So first order of business is make sure your recipe has positive expectancy. Once you are sure, then as a retail, any general rule of thumb from ET experts on risk management and position size should suffice.