This would be useful for simulating looking out of the tower, or plane
spotting. Useful for controllers who would like to observe aircraft
movements visually, of course that would probably mean that they would
have to connect twice, once with PC and once with SB

Sorry, multiple connections are not permitted. Section 8 of the general
rules of conduct states:

8. When logging on to the VATSIM.net network, a member is permitted to make
only one connection at any one time. Multiple connections, either as a
pilot, controller or a combination of the two are not permitted.

This rule was written because each connection is computationally expensive
and contributes to the dreaded lag problem. Because of the performance
cost, supervisors watch for multiple logins. For more information, check
the code of conduct at the vatsim site (http://www.vatsim.net).

There is software out there that allows you to split the data sent to a
single login to simulate multiple logins which allows you to solve your
problem without violating VATSIM rules.

Steve