[unwind]

I wonder if Ben Heck's "Controller Monitor" [1] would help. It's a dedicated low-level (microcontroller-driven) high-speed input sampling/logging platform, with support for reading a light sensor which I believe is used to sense on-screen changes.

It has the advantage of using game console joypads as inputs, and hacking them to read the buttons etc directly, i.e. without relying on USB. I imagine a specialized version that just sampled a mouse button would be more useful in the context of a computer running desktop apps.

Apologies if I completely misunderstood the intent of this post.

[1] https://www.benheck.com/xbox1monitor/