Here's a set of macros that lets you record and play back human mouse movements for automating very smooth/human-like mouse movements in Keyboard Maestro. I just wrote it today, but even though it's a new rewrite of old code, I think it's bug free. But let me know if you find any problems.
The KM action "Move Mouse" is good for basic/autonomous mouse movement, but it doesn't do the job in an aesthetic or human-like way. These macros will let you record and play back human motion, which can be used for purely aesthetic reasons or perhaps for passing server/captcha "human tests."
Mouse, Human Motion Macros.kmmacros (45.4 KB)
As documented in the macro, you will need to set up at least one mouse path using the Mouse Recorder macro. It's better to set up two or three paths first, then run the Mouse Test macro to see the mouse moved randomly using your recorded paths.