If you can't find one, remind me 10 days from now. I'll see if it's possible. Odds are it's hard coded, though

Not exactly what you asked for, but I used to use the Path Avoid mod and paint those squares red to keep pawns off them. I kinda got out of the habit since you can no longer place traps directly adjacent each other and since the chance of triggering is now so low for friendlies. As long as another path is possible, I don't find friendlies even trying to walk over them anymore; mine always seem to walk between.