I'm a fairly new Zimbra administrator and have been slowly learning my way around this neat system.
I've recently moved up in the world and graduated to having my own desk- which means I can use my own equipment.
My mouse of choice (Don't hate me) is an old Logitech Trackman Marble mouse.
For anyone else who has used these, you'll quickly notice the lack of scroll wheel. Fortunately, browsers these days all support the middle mouse button scroll! Even right here on this forum, I can click the middle mouse button (Which is by my thumb in this case) and my cursor will become a scroll anchor.
Unfortunately, it seems this feature simply does not work in the Zimbra UI. I'm assuming it has something to do with the interface coding (ajax?) but I'm not sure.