Show real-life slippage as percentage

It would be nice if real-life autotrade slippage was shown as a percentage of the price, instead of (or in addition to) being shown as dollars. Sometimes $0.1 is a lot and sometimes $10 is a little, especially in futures systems. Also an “average slippage %” at the bottom of the list would be a nice complement (I don’t think this is what “keep after slippage” calculates?)