Binding Zoom to mousewheel

mc-fine

Veteran X
Is it possible to bind mwheelup to zoom levels? So that if you mwheelup up it goes to x2 zoom and stays without having to keep a button pressed down. Then mwheelup again increases magnification and mwheeldwn decreases and brings it back to normal.

I'm not sure how to get around having the button stay pressed down.
 
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