This had been brought up before, but I don't know if it was in IRC or on the forum. I found only one post related to this...
http://www.forums.alientrap.local/viewtopi ... =3248#3248
The idea is if there were a big match (a 1v1 or clan match, or tourney match) where lots of spectators want to join in and watch (more than the server limit) then you could have one of the spectator spots be a relay to another server. Then maybe the spectators could vcall who they wanted to spec in the match.
On a side note, I tested the server demo recording feature and I'd love to be able to select only one stream (player) to record instead of everyone on the server at once. You could even make that a vcall to decide who will get server-recorded.
Your thoughts?