Hi Pils, this is the setup:
Simple Logic mouse, two buttons, single scroll wheel
Clicking and holding right button gives free look
Clicking and holding right button, AND scrolling gives free look AND zoom in and out
Clicking and holding right button over an FCP button, AND scrolling moves that setting quickly, compared to single clicks. Drawback is that as soon as you move a little bit away from the button, you're in the previous free look zoom mode
Clicking and holding LEFT button AND scrolling over an FCP button does nothing, contrary to e.g. the Aerobask Phenom 300
Hope this makes it a bit more clear?