I know that you need to press both buttons to get blackout on a fader configured as grandmaster. Unfortunately this does not work on my midi fader wing connected through Luminosus. I see that correct OSC messages arrives into EOS, but blackout is not activated.
you can control the blackout through OSC directly without the detour through the fader button.
I'm aware of the dedicated osc command, but I use my MIDI wing as direct replacement for universal fader wing or similar so it would be nice if it behaves in same way.
The similar request would be to be able to control the master fader pair over osc ;)
There will always be limitations when integrating third party products. I'm not sure ETC will invest development time if there already is a solution that isn't too inconvenient...
Can you program Luminosus to send /eos/key/blackout when both keys are pushed? If not, that sounds like a much better feature request than asking Eos to behave in a potentially unexpected manner.