Yeah, it's lame, but it's working as expected. This is the #1 complaint from blenderheads, so better one-handed navigation (without shift) is at the top of my todo list.
I'm used to professional navigation from most of the other 3D Programs and it's THE stumbling stone to me for using Blender. I need my other Hand for the Graphic Tablet at work. The haptik feels unnatural at the moment. I don't move my head in real life like that and it comes into play at least, when you have to work on wider models or many objects in whole scenes. This is, where it starts to consume time (using the shiftkey feels like hanging in ropes :p), summing up to a lot of time after a while.
Will this be in the coming release (I think it's 2.64) ?