Enable Scrollwheel-less zooming in Canvas and Graph View

Use case or problem

Mouse navigation in Canvas and Graph View could be improved.
Zooming the canvas without the scroll wheel is an ergonomic enhancement (as proven by apps in the CG/VFX industry, which are very mouse heavy).

Proposed solution

Allow Space + Right Click to adjust Zoom
Just as Space + Left Click currently pans the canvas.

Further, allowing these modifiers to be configurable would be a nice addition.