Hmm,I thinking picking price will give control of what price order is going to be.
How about like this picking price from amibroker (entry) order is place with default SL and target from settings you config for that scrip.problem with this how orderman will know is buy/sell.
In theory you can do it - you can add gui-less support with input params and pass those params from AB. Just look at Trade class and pass it params. Will have to check how to pass params already running ahk for updates (or just modify Trade to work with input order ids )
But OM is not meant for auto trading, you are supposed to verify each trade/update/trigger. Bugs may be hidden too as its hard to test thoroughly. So manual monitoring is must.