Rocker gestures?

Opera, some Chrome extensions, and other browsers have support for what's called "Rocker gestures". The gesture is basically clicking the left or right mouse button while holding down the other. Very useful for quick back/forward navigation on simple mice with just left/right/middle buttons. I have tried everything but cannot find a way to this in BTT. Have also searched the forums so apologize in advance if this has already been covered. Anyone know of way to do this? If not I can maybe post in Feature Request section. Thanks!