Spawning buttons using /maspawn works, though the button is permanetely pressed in.

I'm planning to do a pass over all electrical entities to change their behavior. Right now, they are all set to On all the time.

This has been fixed in v0.14.0, which overhauls how electrical entities are handled by the plugin. I got a basic puzzle working with a generator, fuse box, card reader, door controller, or-switch, and a button. There's now an example guide in the documentation on how to create a puzzle.