Easy risk settings

I would like to see a simple way of inputting my risk ( $500 ) for example, then the alpha ticks risk control tool continually works out how many contracts need to be used depending on how big my stop loss is

Example:

You would have your stop loss and take profit lines constantly on your chart and every time you drag them closer or further away from where the market currently is your risk always stays at $500

similar to how magic keys works