Testing and optimization of my existing EA

I have an existing EA that execute my trade orders according to the specification that I input. I need a developer to check and test my existing EA for me and optimize it according to my requirements below.

2 issues that need to be rectify.

1) After EA entered the trade, when I modify the 'Exit Level', 'Trailing Stop Activation Level' or 'Trailing Stop (pips), the EA did not update and execute according to the new modified value. I need to be able to modify the values of the variables in this EA even when trade is ongoing.

2) I need to be able to set up and run a few EA simultaneously for the same Forex pair but using different 'Magic Number'. Currently it doesn't seem possible.

Thank you