I take some medication that causes a constant tremor in my fingers. My old mouse recently died, and I had read that people with essential tremor do better with a trackball, so I bought one. However, it turns out that, at least with the Logitech M570, which has a fairly small trackball, the tremor in my thumb actually makes the trackball considerably harder to use than the regular mouse. Specifically, it is hard to place the mouse pointer exactly, to hit a small button or to place the cursor to a location in a word. Highlighting a small section of a sentence is particularly difficult - this was true with the regular mouse as well. If I slow the mouse down enough to easily hit a small target, even with mouse acceleration on, it takes 11 complete revolutions of the trackball to get from the left edge of my left screen to the right edge of my right screen.
Now, I could go back to a regular mouse, or try a make of trackball with a larger ball. Or I could shell out $150 for SteadyMouse, which might do what I want, or might not, but in either case seems to be priced on the assumption that the consumer's insurance will pay for it. But this seems so obviously a problem that should be amenable to basic settings adjustment or an open-source solution that I am frustrated that I have not yet been able to find one.
Here are some things I think might work, if I knew how to implement them:
First, it seems like mouse acceleration might solve the problem if it just accelerated enough. Some earlier versions of Windows had an acceleration slider like the speed slider, but if there is anything like that in Windows 7 (desktop) or 10 (laptop) I have not been able to find it (an acceleration parameter in the registry, maybe?).
Second, if there was a smoothing setting (as opposed to the "enhance pointer precision" setting, which oddly turns off acceleration) that did averaging over either small movements or short periods of time, I suspect that would provide sufficient stabilization to let me use a pointer speed that is reasonable for large movements.
Finally, I think the basic structure of mouse acceleration, mapping trackball speed to pointer acceleration, misses the point somewhat for people with tremor. Tremors are not slow motions - not at all. I think my thumb tremor moves the trackball faster than I can move it intentionally, for very short distances. What I think would be most helpful is exponential amplification, not of speed, but of distance. I'd like to be able to get across my screen with two or three turns of the trackball, but map a quarter turn to about an inch. But I am pessimistic about this being available in settings or in any other way easily available to me.
I'd be very grateful for any solutions that anyone might suggest.