the concept of overdrive specifically was created to do away with metal makers, because metal makers work on a flat return rate, whereas overdrive generates less metal the more energy you pump into the system / the fewer mexes you actually have in the grid to overdrive.
this means map control is important and you cant just stay in your base and make metal through metal makers, and it is intended to be that way.
so i guess the only way for this to happen was if somebody was to make a modoption.