Hello,
Rest assured, even if it's a bit difficult to keep a good eye on everything (here, facebook user groups, other forums on the internet) we try to do our best to log everything on our bugtracker. For sure some cases may be missed in our monitoring on field (like this one about master volume obviously, sorry about this)
of course, the best way is to log a ticket to our support team, but again it can take some time to reach our Test QA department, which is supposed to link it to developers and product managers.
Anyway, regarding this specific long-time wanted control on master volume by CC7, it is now officially logged, but i can't guarantee it that it will be implemented.
So, thanks for your patience, and sorry again for the inconvenience.
Best regards,