Your feature request and solutions is not a solution to the real problem.
What would you do, if you in example wan't to use multiple Analog Lab instances, that you can play on different midi channels, if all your Analog Labs play all the time, no matter which midi channel you set your controller to send on?
And what if you have 16 synths, you wan't to send seperate midi messages to?
You need to be able to seperate the incomming midi messages to the individual instruments.
Good you have contacted Arturia support. I will be very interested in Arturias reply. I would say, that the Global midi channel setting should work when it's there.
BTW: Using Master volume to set volume like you suggest can be very bad. Keep in mind, that for many presets, you will get distortion, if you set the Master Volume too high.