Q Light Controller+

I would like to have feature to exclude some intensity channels from Grandmaster slider. Here is scenario: you have different groups of regular light on your dancefloor/scene/etc (that you're controlling live with using Grandmaster,too) AND you have some architectural lights (that need to be ON all time). At moment you need blackout of all light EXCEPT architectural. Using "exclude from Grandmaster" feature is the simple way to do this. I think, it can be like modifier or "can fade" in "channel fade configuration".