This is something I have in mind for several years; but that has not been implemented yet...
The tracker where bugs and features are reported do its job; and it suits pretty well my needs (compared to others I can/have to test). But; if it is possible to report a bug or ask for a feature, nothing exists to know their popularity...
This is a feature request that exists for years on Redmine; but project's developer always refused to implement it. Several plugins were developed; but they seem to die quite soon after, unfortunately :/
I'd really want to avoid to duplicate information, but this is not possible. So, I propose you to vote for future Galette features using Fider :)
This voting system will not replace existing tracker; and popularity of any entry will not imply it will be implemented in the next release, but this will help me to know which feature you are waiting for!