I don't know if this request is within the scope of this module, I tried to get some people from Roll20 to FoundryVTT the other day and as several of them were on touchpads (laptops without mouse), they complained about the absence of the zoom buttons (the buttons that Roll 20 holds at the top right) to which they are evidently used.
They didn't like the right-click option standard (or the middle variant of this module) very much.
Would it be possible as an additional feature to this module that already manages the touchpad and other settings to add the two buttons on the top right? a bit like the Visual Active Effects module does with the effects only with the two squares of plus and minus always fixed.