I am so used to this I dont even need the loops anymore xD Need to put the loop toggle on a hotkey to make it useable and remove modbatch to force myself.
In Hotbuild2, it's already on a hotkey, and I talked to Metabolical, and he says that at some point in the future the UI and keybinds will have much better implementation, so it will likely be a default keybind to toggle build mode. So far no. Because there isn't an option to add something to the beginning of a looping queue but then never build it again (unlike with SupCom's assisting factories), if you just want a factory to spam one unit indefinitely you can easily make it build at a very low ratio and then add the other unit to the front of the queue when you want to.. E.g. 100 Ants, one vehicle fabber.
Don't do it. Just rewrite it to be as illegible as possible. Ahh.... see how I help everyone out. I'm so good XD.