We recently deployed krpano HTML5 on a 65" UHD touch tabletop surface. It technically works fine, but experientially we're finding a difference between how people assume it works on a small screen vs a large screen. On smaller tablet-sized screens, people use one finger per hand to zoom in and out. On the very large screen, we note that people use multiple fingers per hand to zoom in and out, or even their whole hand. krpano behaves strangely when users do this.
A fix might be a way to ignore multiple fingers which are closer together than some threshold, and treat them as a single finger.