I just have always had a lot of problems in general with GTK programs on Mac (well, admittedly I've used just GIMP and Inkscape) that involve scrolling and zoom

I just have always had a lot of problems in general with GTK programs on Mac (well, admittedly I've used just GIMP and Inkscape) that involve scrolling and zooming with Magic Mouse. The action is just not smooth and jumpy, which makes things imprecise, which is incredible frustrating for graphics programs. Not to mention it isn't a good user experience. I've seen an open ticket that puts points the finger at refresh rates being out of sync. Don't know if a traditional scroll wheel would fix it, but I really like my Magic Mouse.