I've noticed that the Immersive Engineering Crusher doesn't properly change states.
No work, no redstone signal: Keeps previous state (idle or spinning). Expected idle state.
No work, redstone signal: Keeps previous state. Expected idle.
Work, no redstone signal: Spinning. Expected spinning.
Work, redstone signal: Idle. Expected idle.
Naturally, I feel like it should stop when there's no work being done. Have you experienced this in your testing?
Actually, this has been an issue extensively discussed on their bugtracker.
See issue
#346 for the initial discussion and issue
#380 for some resolution. It was posted Oct 1 and you updated your pack to 1.1 on Oct 2 but they haven't updated the official release since Aug 20.