PCB Editor: how to change mapping of mouse wheel?

Hi! I want to change the mapping of the mouse wheel. Actually, I would just to invert it's current behavior (e.g. to match Cadence IC tools like Virtuoso):

-Wheel-down should be zoom OUT
-Wheel-down should be zoom IN

...where and how can I change these bindings? In virtuoso these are defined through "bindkeys". How is this handled in PCB Editor?

Thanks and regards,
Jorge.