You can also interrupt pathfinding with engis on attack move (or SACU/ACU on patrol iirc) and they will lock on to and reclaim a single target using fac attack move range, which can be useful for this scenario.
I've never seen it as shitting on someone's dream, and I'm sorry you took it that way. It was meant to be an explanation of why it hasn't been done and why I don't think it's a good idea.
You didn't have to call yourself out and bring receipts! I wasn't gonna play detective. One of the commenters in that thread was tatsu and he was involved in Sanctuary. So even though I put my plans on temporary hold I'm glad tatsu forged forward.
I just recreated it with Czar. I may be dumb. It happens when 1 hotkey is responsible for several units, and it locks your clicks for you to order with left click. I just had to right click to get out.