@tonyyeb
Err, no. Because this bug only happens on Snow Leopard, which in turn only runs on x86, MorphOS won't save you. Why? Because MorphOS doesn't run on x86. So you can't run Snow Leopard and MorphOS on the same machine.
But if you really want to praise MOS some more, I'll give you an argument that sticks. This SL bug has to do with user management, which MOS doesn't have. So this could never happen to MOS.