I haven't added this because it seems that a better solution is to just set the touch screen auto-hide to a very short delay, like 2 seconds. And do you really want to take up valuable touchscreen space with a button just for hiding the touch controls?

One more UI suggestion to make UI settings less confusing:
Perhaps button opacity should be renamed to Buttons Transparency and the % should be swapped so the higher the % the more transparent buttons will be?

I haven't added this because it seems that a better solution is to just set the touch screen auto-hide to a very short delay, like 2 seconds. And do you really want to take up valuable touchscreen space with a button just for hiding the touch controls?

I mean in some games you do have to bind a lot of combo buttons as its inconvinient to press multiple buttons at once anyways soo, and autohide for like 2 seconds can be a bit annoying for regular gameplay.
Touchscreen space is not an issue either because you can set the buttons to be very transparent and almost unnoticable.

One more UI suggestion to make UI settings less confusing: Perhaps button opacity should be renamed to Buttons Transparency and the % should be swapped so the higher the % the more transparent buttons will be?

that will require adding a new setting and a conversion function to preserve user's settings. Not really worth the trouble, IMHO.

Ok, I guess it's a pretty easy addition. I'll add it soon.

Turns out we already had the TOGGLE_TOUCH_CONTROLS command, binding that to a button does exactly what you want. Unfortunately, it was not available for binding to touch buttons, and #20035 fixes that.