The AI "player" not that I've seen. But for your units if you cancel "free move" mode your units will usually stay in the stance that you've given them.

this doesnt work, and im having the same problem very annoying. The only thing that works is if you go to brain section in editor while selecting your units and turning the control to the user and the ai move to disable. the units will stand in f1 unless you unselect them, if they are selected they stand. however i realized that the ai move when set to disable sets itself back to enable. This must be fixed becuase it ruins the point of the mod, in the time period no one laid down in a line battle.