Some steps to start with.
In the 3D-Connexion pref panel.
Select the Space Navigator if you have more than one 3D… item.
You have to add the layout application to the list. ‘Add Aplication’.
Search for the Layout.app.
Select it, the app and then choose f.e Buttons.
Select left button.
Choose System Events
Go back to Layout. Press the left button and your Mac will go to sleep.
Oke now serious.
Set in Layout f.e a short cut for ‘Zoom In’. I did use shift-option-i.
Go to the Space navigator.
Choose Left button.
type ‘i’ and set the option and shift checkbox.
Go back to Layout and press the left key.
I hope I didn’t forget any steps. Will check later tonight.