How do you intend on performing your tests? Just by continuously testing your own mouse precision performance? Would it be possible to emulate touchpad input?

How do you intend on performing your tests? Just by continuously testing your own mouse precision performance? Would it be possible to emulate touchpad input? Maybe see if you can record enough touchpad data on macOS to be able to make a replay driver on Linux, or maybe with an arduino emulating a touchpad with synthetic input. That way, testing could become a set of test cases along the lines of "given this input and a cursor at position 0,0, the cursor should end up at position X, Y", and you'd be able to see how big the current error is. A bunch of those tests with various recorded movements should be a lot more stable than a human test.