Yep, that would also work.
I guess a better ‘problem’ description is:
Your gain structure isn’t right, but the output level currently is. If you adjust your Gain, then all the outputs will be messed up, and will all have to be fixed. Wouldn’t it be cool if you could do this in one go, rather than have to do each output at a time, thus giving bad output levels while you are fixing it.
An example of that is what is described above. Another would be that after playing for a while, you realise that all the musos are happy with their mixes, but the main fader for the bass (or whatever) is around -25, so making small changes is not possible. It would be nice to be able to fix the gain structure to allow unity-level mixing (roughly….) without messing up all your mixes.
This is a feature request / suggestion, rather than a ‘oh help, I don’t know what to do!’ kind of thing.