Vertical/Portrait zoom restraint?

[PhoenixAZ]

Hi,

Maybe somebody found a solution here...  I'm trying to apply zoom (not pan and zoom) to a video or picture that is 9:16, as opposed to 16:9.  I have my preview resolution changed to 576/1024 to reflect that both the preview and video are vertical.  With that, I'd like to zoom in with a 9:16 restraint, but the only restraints offered in the zoom menu are horizontal.  I noticed that when using pan zoom, the selection box is vertical...  but why not in regular zoom?  Sure, I could rotate the video, add the zoom, rotate it back, etc. but I'm looking to simplify this without a work-around.  Is there a way I can choose custom zoom restraints for use in a vertical video?  I tried using the "None" option in restraints and use my best guess, but it's usually off.  I want to keep the 9:16 dimensions perfect...

Thanks!