It's not supported in every application, but most web browsers & document browsers have some kind of middle-click autoscroll situation. You may have to toggle i

It's not supported in every application, but most web browsers & document browsers have some kind of middle-click autoscroll situation. You may have to toggle it On in the settings. Basically you middle-click once (or click & hold), a little scroll icon appears, and then the document scrolls based on how far your mouse cursor is from the scroll icon. Click again (or release) to stop scrolling. Functionally it's pretty similar to the pitch bend wheel you describe. Works great when it's available.