Zoom in/out timeline with mousewheel in ardour 5?

Hello everyone. I’ve just upgraded to Ardour 5. I’m a OSX 10.10.5 (yosemite) user.

In good old Ardour 4 I was able to zoom in/out the whole timeline just by hitting command + mousewheel.

However, I have to press the = or - keys now in order to zoom in/out.

Is there any way to config the zoom in/out back to the command + mousewheel? Or even to ANY combination using the mousewheel?

Thanks for you attention!