SQL 2005 SP1 - Enable encryption between server and client

Looks like the one of the new features mentioned in the SP1 release notes is located here:

"A registry switch has been added that you can use to control encryption between a master server and a target server (MSX-TSX)."

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQLServer\Client\SNI9.0\GeneralFlags\Flag1

It looks like it is a DWORD toggle of 0 or 1 with the setting of 'Value' determining whether or not to use encryption between the SQL server agent and SQL server.