Position Z Transform

I'd like to be able to have my puppet start far away and then, while recording, gradually move him closer to me while staying in the center of the frame. Currently, as best as I've been able to figure out, I have to work both the Scale and Position Y Transforms at the same time to achieve this. I think a Z Transform would address this. There may well be a way to do this one already that I simply haven't figured out (true, I suppose, of all my requests). If so, please forgive me.

Feature Request: A very simple Z axis Transform so you could resize without losing position.

Martin