Pyrotech has some mechanical bellows that speed up the machines like the bloomery, sawmill, etc.
To get them powered, you attach a gear (from pyrotech) and it will run automatically. The quality of the gear has no effect on how fast the bellow runs, just for how long (gear durability).

It would be awesome to have a Bellow that can be powered using the mystical mechanics API that would just keep running as long as it has power (maybe configure how much rotation it requires before it runs? or affect the speed of the bellow).

I thought about looking into how to make that mod, but i figured i'll see what you think first, since there are some awesome machines for other mods in this mod already.