Pathing stuff like this is really tied into the engine so there's not much we can do. I think you can't even make ACUs path over units because it would automatically apply that 1x1 footprint to all 1x1 units (all t1-t3). So a lot of it is wishful thinking unless you dive deep into reverse engineering.
I think this would be a good thing as I dont believe players consider the known poor pathing in this game to be a positive aspect.
The bad pathing has cemented itself in the game's balance and micro so for some it is a positive aspect just to diversify supcom from other games, even though it has its frustrating moments.