It would be really nice to have zoom on scroll wheel (instead of scrolling through the Y direction), and a drag-to-pan operation on the middle mouse press.

I hacked in the former for myself locally and it improved my experience with this drastically, but sadly I can't really manage to understand the rabbit hole that is tool and input handling :P

Though, the scroll wheel thing might need to have an option for that, given that it is currently used for, well, scrolling the canvas in Y direction.