So I've been trying to get some animations up and running and the zoom feature in spine is driving me nuts. I should specify that it's the zoom out feature specifically.
When zooming in it centers on the mouse, one of two logical choices (the other being the origin). This is all well and good and usually saves you a step in not needing to pan after zooming. Zooming out contradicts this behavior however. When zooming out the focus is not under the mouse pointer. This causes your work to float away from you. You want to zoom in on a characters ear, so you hover over the ear and zoom in, it's centered and everything is great except oops you zoomed in a little too far. So now you zoom out and the ear floats away from you.
Of note: I'm on OS X 10.8, retina macbook using touchpad. All might be relevant factors.
TL;DR: Zooming in centers on mouse while zooming out doesn't.