Script to change EA to long only/ short only at a price level?

I know there are scripts that will disable live trading entirely if equity reaches a specified level.

Is it possible to programmatically change an EA's common options so that it will trade long only / short only or both long and short once price reaches a specified level?

I think not. You need to modify the EA. What can work, to make an indicator/expert, which load and close chart template. It works whit indicators, you can load templates whit different settings, but I never tested with expert.