Another thing that would be nice if it was easy to make: a button to place the cursor where you’re looking.

I don't know whether the software side is there or if the box, but it certainly seems like https://gaming.tobii.com/product/eye-tracker-5/ ought to be able to do that.

I've always wanted window focus to go where I'm looking, it would be so nice.

Probably with a modifier key though so I don't move out of a game just to read a wiki page though.

I agree it's not faster, especially when using a simple WM with no animations.

However, I also find it easier to recall where I was looking by moving my head between static content instead of having it change.

FWIW I use a 32" screen positioned so that I barely need to move my head to see it all, and try to have all things I'm looking at visible at the same time.

I did think that for years and I scoffed at multi-monitor setups thinking they were a poor imitation of the virtual desktops that have been present on *nix systems forever. But they are both good and complement each other.

I use virtual desktops as more to separate unrelated areas of work (like different projects). It's like having a completely different desk with different books open on it. Having more screen space is just like having a bigger desk. It's like having multiple books open on your desk at once as opposed to picking up one at a time to look at it.

One big monitor would be ideal (it could be split into an odd number of frames, for example), but in practice multiple monitors is a good compromise between flexibility and price.