Thanks for the report, although as you're using 1.79 (and thank you for noting that you are ) which is not yet a finalised or released version then it may be that the glitch is on trunk-side, or something that has changed there to form an incompatibility.
Anyway if I get a little time later I'll take a look at it and see if I can replicate the issue. The line itself is valid (at least for the current release version 1.77.1), but it may be that the changes in 1.79 about saving in other places could be altered things.
I think you mean the red "!" which cause that player can deliver double hits on main stations only which shoud be the opposite. You can remove this exclamation mark from your file and Thargoid can fix it in the original OXP imho.
The equipment is switched on and off with shift+N. It doesn't auto-activate as it takes additional energy when you shoot, so if you aren't careful then you could get into serious risk of destruction during a fierce fire-fight.
In that way it works like several other pieces of primeable equipment.