the DJ's have to KICK sc_trans off so they can connect. There isnt a method where it can support 2 or more DJ's or sources and determine whos turn it is.
Sc_trans (transcoder) plays/streams to the server, a DJ can then login to the admin page and KICK that source off and connect. When they are done and disconnect sc_trans can connect. You can setup sc_trans to reconnect every 30 seconds, giving the dj only 30 seconds to start their stream.
Not automated by any means, what do you expect for free