Hello,
If you have the camera locked to a viewport and you interactively dolly, the camera (correctly) is transformed. However, if you interactively zoom (Alt click in the viewport) the Window Size parameter is changed!! This is so wrong I don't know where to start! How about zoom = focal length? How about Window Size is a completely artificial and unintuitive (but useful when properly used) value that no-one would ever think to look at? How about no other package in the known universe does this?
OK, it's not that big a deal, but it should be fixed )

Cheers,

Peter B