Repositories of repositories with meta information

The idea is to maintain a list of known repositories, with meta information about each of them, like a safety rate given by users, which distribution/version is targeted by the repository, and misc informations like a description, an icon, licence,...

For security, it would obviously require a master key to sign keys. This would permit to add a repository more easily too, by only selecting it in a list, then the deb line and the key are automatically added.

A graphical interface should be provided, showing the list of repositories with meta informations, featuring an integrated rating system and critical safety reporting system when a user detects a potential malicious package.

Then when one clicks on "add this repository", an appropriate message is displayed, like :
- "This repository has been fully approved by most users (nb approved / nb total) but not by the ubuntu team (s/ubuntu team/repository master/) yet"
- "This repository has been fully approved by the ubuntu team (however, it is not officially supported)"
- "This repository is said to be very unstable and may crash your system"
- "This repository has been reported as dangerous, you'd better wait while the ubuntu team examines the report"
- "This repository contains closed source software. This is a potential risk since nobody but the authors can check it's safety" ;-)
- "This repository is for another architecture (hppa-64)"
- "This repository is for a prior version of ubuntu"
- "This repository is for another distribution (debian testing)"

etc...

What do you think of this proposal? I think it is a good way to simplify a lot of things for users who want third party software.