Perhaps for inputs, provided that you use a gang for each stereo pair, but also for stereo effect returns? I know it may be a rare use case, but I already stumbled upon it twice in the short time that I own this thing..
Btw; one thing I found out about ganging, is that a channel can only be in one gang at a time, even if different gangs use different features (let’s say one gang for eq’s and one gang for levels). So if I have to create gangs for stereo inputs, they can’t be ganged with other channels anymore.