How does this mod differ from https://mods.factorio.com/mod/DoubleSpeedBelts by Darkfrei? The main difference I see is that Darkfrei's mod is older (also for 2.1 now) and has a lot more downloads, but maybe your mod works better with other mods that add/change belts?
This mod also affects assemblers and furnaces. I will probably remove all belt related logic in a future update and make this one just for machines. (And make an actual mod description and modpage.)
