My only problem with having the gestures on the trackpad only is that I have both a mouse and a trackpad so I would have to take my hands off the mouse to use the trackpad (and I'd drop any object I was moving). The beauty of using the mouse scroll wheel is that you can scroll mid edit, while you are moving something - an object, a line-point etc. Having pan on the spacebar invalidates it's use during text editing which is a shame so I'd ideally like a secondary button that had no effect during text editing - maybe Control could step on or a modifier could be applied to space. I could, however, see myself happily switching to the trackpad during a text edit for this reason. I *do* find moving back to any editor I used heavily before I embraced zoom & pan feels like going back to the dark ages. I've tried Fireworks, Ai and Photoshop and they all drive me mad (even though Photoshop has some support for it).