Looking for help with a camera bind

[gourdhead]

So, I'm trying to write a bind that allows me to press and hold the Lshift button to enter "Teleport Mode", with the camera moved to max distance back and all windows toggled off, and then have the camera return to "normal" on release.  Is this doable?  I heard a rumor on the Help channel that zoomin and zoomout might have that functionality, but I can't get the nomenclature to work.