Any chance you could add options to modify vanilla tier belt speeds and stack sizes too? I know you wanted to keep them independent, but I hate to add yet another mod to do this. Oh, and underground distance....
My Goal right now is to create a TRAIN dominant playthrough. As such, I am heavily nerfing other methods of transportation. Belt speeds are cut by a factor of 5, stack sizes reduced, recipes more expensive if possible (still looking). I am using your mod to make expensive ways of making belts approaching vanilla speeds, but want it to be inconvenient enough that I will prefer to use trains for any significant length or throughput.