1- In the remote control policy for a user or workstation, you can choose to disable the users ability to unload the remote control agent, and even remove the icon from the system tray.
2 - When you unregister a workstation, the inventory, WOL, Remote Control, and imaging to not function for that workstation anymore. In your server policy, you can change the workstation import policy to name the workstation object by user ID. Then you can make the workstation register on every login. And to do the removal, set the auto remove policy to just a single day. I don't think this will work the way you intend.
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