Make mouse scroll wheel the zoom (without pressing control) instead of up/down scrolling

Would love the option to have the mouse scroll wheel used for zoom (without having to press CONTROL). Since we can already move the canvas with the left or right mouse button, we can quickly navigate in any direction - up, down, left right.

Why not have the mouse wheel be able to be set to zoom (again, with out the control modifier)?

Thanks for considering it,
M.