The profile rundown on the left side of the screen sort of cuts off the portraits of your parents, grandparents, and children since it's squeezed in there so much. However I am having problems with the resolution. (it's also the only way to scroll through a pop-up window with a scroll bar without actually clicking on and dragging the scroll bar.) So that's a nice one way to do it if I don't also want to be snapped back to my capital. I set one of the touchpads (I think the left one) so that clockwise and counterclockwise finger tracing on the pad would scroll in and out. Then I have another totally separate way to zoom in and out. So I would click the left stick to zoom in, and squeeze L2 a couple times to zoom back out. The other stuff I did was set L2 to reverse scroll wheel. That's the only default binding I left in place with regard to zoom.
I believe the default zoom is clicking the left control stick, but the weird thing about it is, it also takes you to your capital county simultaneously with zooming in. I was just figuring this out this week actually.