I have a process I carry out when I'm analysing a potential trade entry. When I see an entry signal in the form of say a pin bar, I bring up the cross hairs on the MT4 chart, place it over the current market price, the bid or the ask depending, (Which at the time of my analysis will be at the close of said pin) and then drag it up or down to where I want my potential stop loss (your indicator object) to be for this particular potential trade (Usually above the top or below the bottom of the pin).
The cross-hairs will then display the distance, in pips, between the entry price and where my potential stop will be placed. Now knowing the technical risk distance in pips I now weather its a very wide stop loss and I'd be lucky to get a 1:2 R:R or if it's a very narrow stop loss and, knowing how much the market tends to move, I could realistically get a 1:5+ R:R, more, less or anywhere in between.
This could usually be done by simply looking at how large or small the pin bar is, but MT4 stretches and compresses and warps the candles depending on how much or how little the market has moved and to fill your screen accordingly. Resizing before every trade just adds to the trade execution time.
I use money risk set at a pre defined amount, so I risk the same amount each trade by adjusting my lot size accordingly (this is where your indicator works beautifully).
So I assumed having one more bit of handy information called 'Risk distance' or 'stop loss distance' that simply displays the pip distance between the current bid/ask price and your stop loss level object that I continually move to suitable levels before each potential trade.
I hope the above explanation helps somewhat. Thank you.