What it does
Pauses shaking when the macOS screensaver is active.
How it works
Shake It On listens for `com.apple.screensaver.didstart` / `didstop` notifications and falls back to checking whether ScreenSaver.Engine is in the running-applications list.
Where to find it
Settings → Paused When → Screensaver is running. On by default.
When to use it
Always. Shaking the cursor would just exit the screensaver immediately.