I read somewhere that the Qolsys has to be the primary controller else you lose all ADC control over Z-Wave (still true?)
No, I think the thread you saw was regarding the original IQ Panel, FYI, not the IQ Panel 2. Also, firmware 1.6.1 I think fixed this on the original IQ Panel.
Are you using a Qolsys IQ Panel gen 1, or the IQ Panel 2/2+?