Amend current EA to build in take profit and stop loss in total for the EA in equity

Hi there

I have an EA (Send Buy & Sell - attached) that I want to make a change to.

This EA allows you to place 2 trades on the same currency pair in different directions (buy and sell) at the same time. For each of the trades (buy and sell side) you can place a limit and stop in pips.  

I want added to that a stop loss and limit in value / equity / deposit currency for the 2 trades combined. 

So I will have the option to choose a stop loss or limit for each transaction as it is currently OR

the option to type in the stop loss in $ (equity) terms for the combined loss for the 2 trades and type in the target combined limit (profit) in $ (equity) terms.

e.g. I choose to type in the stop loss - lets say -$500 and the limit +$750.

Both the long and short trade is closed when the combined profit on the 2 trades reaches +$750 or the combined loss on the 2 trades reaches -$500.

Why:

 I want to increase my trading volume but keep my overall leverage low (i.e. buy 20 lots and sell 19 lots = effectively 1 lot in the market). The variable spreads however means I need to close both the long and the short trade at exactly the same time in order to keep my effective leverage low and not risk an overleveraged naked position.