Feature request: Read-only users who can't create repos

[Koshell]

I was trying to find a way to allow users to have read only access without the ability to create new repos or even better, read-only access to user-specific repos and no-access to others.

My reasoning is I was thinking of embedding a ssh-key into the scripts i write to allow them to automatically update themselves with a git pull. But ideally if someone pulled the key out I don't want them to be able to start uploading whatever they feel like to my git server.