Been working on this myself.
Looks like from
sadoun.com
quad lnb page there are new pictures.
Shows
LNB --> DISEQC SD21 --> MOTOR --> rest of chain etc...
Multiswitch is what I'm working on grasping now.
Seems you could feed different satellites into the multiswitch, driving multiple receivers which select their own satellite feed without affecting others.
Limitation would only be where there would be a master unit controlling a moving dish, otherwise dualing commands for satellite selection.
I thought fighting over the remote was bad, imagine fighting over the
remote control of the satellite pointing commands.