Redo 'priority material' in excavators

Using the new 'priority material' function of the excavators does not seem to help (me) much. Mining still has some frustrating aspects.
I think it could be solved by moving the 'priority material' selection to the mine control tower. Also, instead of prioritizing what the excavators scoop up, it should affect trucks. After all, we do want dirt and rock to be dug out in our iron mines as well. It might be necessary to get to the good stuff.
So with the new system, the mining tower tries (if enough are available) to assign 1 truck (the largest available) to each excavator. This is used exclusively for the priority material. Other trucks and empty trucks are held in a 'pool' close by the excavator(s) (probably following excavators like they do now), but they should be able to switch from one excavator to the other if what they are carrying is scooped up by one of the excavators.

It is really similar to my suggestion, so I just write a comment here, but not create a new one post:
Now we have an option to set a mining priority by single excavator, but I think it will be great to have same option by Mine Control Tower, so we don't need to apply priority by each single excavator. And priority by excavator will be greater than priority by Tower, I think.
Also, I think, it will be great to have an ability to control excavators priorities via Mine Control Tower, so we easily can set 5 excavators to iron and one to rock or dirt e.g. and not clicking each excavator.