[With regards to the zooming and panning, this has been answered on our forum. So hopefully using the 'CMD β' key with the wheel is working ok for you.]
Martin, I have sent you an email - sorry, but I didn't see your email before posting on this forum. Thanks for clearing things up for me. Please don't get me wrong, I think Shaderlight is amazing and I know that these Mac bugs will be worked out in time. It is just frustrating when you are working on a tight deadline.
As far as zooming and panning is concerned. Holding down cmd and scrolling with the wheel zooms the Mac screen, therefore making everything larger, including the Shaderlight window, it does not affect it separately and there is no way to pan the image.