It looks like Creative Suite CS5 has amended their zoom keystroke bungle they released with CS4. I wrote a post about it here. They changed the default keystroke of zoom to m (and renamed it Magnify) to make room for a third string tool like the Bone tool. Firstly, bone doesn’t even begin with z, so why would it make sense to transpose those? The keystroke for the Zoom tool is z in every Adobe program, so why was an exception made for Flash? I guess there was a public outcry or Adobe checked their user data and found that everyone changing it back to the way it should be.