How do I program the ctrl+scroll wheel to control zoom?

Ashley Guberman you can program the "Mouse Motion" to Scroll Up and Scroll down, like it is programmed by default on the Blue Layer (see attached image). Once the trackball is programmed to that, you can use it as a Scroll, and Ctrl + Scroll should work.

That's what I would have expected. But see the video for deeper problems.
https://youtu.be/2lnYt3td5Yg

Ashley Guberman, oh I see what you are saying. You are trying to set a modifier to the mouse movement. Currently, you don't have the option to set a modifier on mouse movement (it should be disabled on those specific areas, which is on the list). So, you would need to press Ctrl + Scroll separately.

OK. That's a bit awkward to have to press two keys and scroll, but at least I know now to do it now.
What about the update text in the title vs no update available?
Or the settings on the keys going away as shown in the video?

I understand. It is added to the feature request list. Also, we will look into the "Update Available" message, as you are on the latest version. As for the Ctrl key modifier assignment, it is not actually assigned, until you click ok and it shows the little pink dot on the key. I think the reason the Ctrl is checked when you go back into it is because that is the last one you assigned to it before, so it just defaults to it. Again, it won't actually assign Ctrl to it unless you click "Ok" instead of "Cancel". If you uncheck the Ctrl selection and click ok, when you go back in, none of them will be checked.