There's a mechanical spring idea i wanted to make but i fell like this mod does almost EXACTLY what im looking for, and i figured it would fit right in as an awesome addition to the mod.

The idea is, you have two machines, one that allows you to apply a rotation force to a cell, and store energy like a airtank.
Then, you insert it into another machine. This one has a UI that has some setting on how that energy is used. (my head-cannon is using a speed governor with a spinning fan or similar) This sets the speed and SU it uses per tick\second or other interval. The cost for high SU is of course using more tension in the spring-cell.

This would allow a new way of interacting with generated strucures that also have a slot to insert this spring-battery, allowing you to open doors, extend or retract bridges, or other various options. Let's you test out builds or store large amounts of mechanical energy over time as well. Could support mechanical hand operations too.

I have a rough model made for it, the textures are 16x16 made in blockbench. Not final idea for look, maybe some more options for a cog variant like how andesite casings place overtop.

quick look at the idea.
https://github.com/mrh0/createaddition/assets/24412690/de8cfca5-3438-41e0-87e4-eb7e082b06f2