Hi, The gefen splitter is controlled from one of the STB controllers (In my case nr 1-Gefen code is built in to the STB table, you cant see it on the STB table, its activated when you switch on the HDMI expander in the connections menu. I have ATV on 4 with TV button, SKY HD on 3 with DTV2/V-AUX & Freesat on 2 as DTV.
With the software 30.03 update you can switch of the TV analogue tuner & use the TV button for whatever you want! This update is supposed to be only for 7-40 MK2 TVs with the HD module but it works perfectly without it, as mentioned above you have also the use of DTV2 instead of V-AUX.
So o answer your question, yes all SKY HD & ATV1 are connected to the expander which is connected to the DVI, leaving Component free for other HD sources.
P.S S/W update is 2 chips in TV and a Flash update from dealers service tool, chips cost me € 50, update was free.
Regards Douglas