Because it is not possible from the View Connection server to shadow a View session i'm interessted to know what tools (3e party) you are using to shadow a Windows 7 View desktop?
If you want to shadow a desktop through the vSphere Client console, you can use a GPO to allow this. Details: Accessing a PCoIP Session From vSphere Console
We use Timbuktu for remote support.
We put the join.me application launcher on the golden image then put in a shortcut in the all users start menu. Still requires user initiation so for auditing purposes (shadowing), this would not work.
We are also interested in a shadowing scenario where the user wouldn't know our legal dept was watching their screen.
If you want to shadow a desktop through the vSphere Client console, you can use a GPO to allow this. Details: Accessing a PCoIP Session From vSphere Console