OOH, I think I understand now, I had to first disable the default settings and THEN make a custom configuration with the channel, I did it in reverse at first and didn't work, THANK YOU!
AND Thank You for making this extension, it is very useful!
YES, please add it! It would be extremely useful! I've been searching for this option but the fact that I have to add every channel I don't want changed manually is very annoying.