Once hauling order

When facing extremely busy vehicles management in context of a resource crisis, I sometime need to have just a few units of some resource produced to unstuck the situation. Currently, to do this, I have to raise the priority of the producing building I want, wait for a truck to fill it, wait for the material to be produced, then lower the priority back to its original value.

What I would love to have is the ability to pick a truck and explicitly assign it a single task once:
* pick some resource there,
* drop it there
* then go back to auto-assignment
This would allow to quickly respond to stuck situations, at the expanse of player time.

That's why this feature, while very useful in specific situations (it could even save a game on the edge of a total collapse) should generally be avoided to rely on auto task assignment