How to use a wacom tablet zoom feature to zoom in and out in microstation?

I have a wacom tablet intuos and when I use the scroll function of 2 fingers moving up and down it seems difficult to get an accurate zoom like I do with a standard mouse wheel.  I would like to try the wacom zoom feature where you can pinch similar to an iphone, any ideas on how to get the zoom feature to zoom in and out in Microstation?

Thank you for any ideas.

-Dan