I didn't went for upgrade yet, customer was calling me from a location with that problem.
Hik support later told me about Aux being enabled after 4.40.500. But will recommend 4.51.100 ( witch i actually used with DS-9632NI-I8 and is completely different from 4.4x.xxx versions).
We've never used Q-series NVRs so I can't say for sure, but the datasheet says the Video Output mode is "HDMI/VGA simultaneous output" which means it will probably behave the same as the old K-series models described in the first post of this thread.
The video output would be exactly the same on both the VGA & HDMI output if you connected two monitors, you wouldn't be able to have different layouts on each screen.