I think this is what you are asking? I used Andrews formula
ROUTE+SMRTL;Share=100;TIF=DAY+;Price=ASK+0.10;BUY=Send;ROUTE=STOP;StopType=Market;StopPrice=AvgCost-0.50;Share=Pos;TIF=DAY+;SELL=Send; LONG POSITION
ROUTE+SMRTL;Share=100;TIF=DAY+;Price=BID-0.10;SELL=Send;ROUTE=STOP;StopType=Market;StopPrice=AvgCost+0.50;Share=Pos;TIF=DAY+;BUY=Send; SHORT POSITION
I then changed the share and avg cost to set share size and size of stop. I assigned shift 1,2,3 etc for long positions 100, 200, 300 etc. This allowed me to set a share size with what is appropriate for my risk tolerance per trade. I used Ctrl 1, 2, 3 etc as I did above for short positions. You need to hold shift and hit the number twice to set order, then stop. This has worked for me I hope this is helpful.