In Trac v0.12, multiple repositories are supported for a project, either via the trac.ini [repositories] section, or via the database. However, this plugin, only supports the single repository specified by the authz_module_name parameter when show_all_repos is set to false.
In situations, such as ours, where the svn authz_file supports repositories for multiple trac projects, we don't want the admin of one project to see information about repos belonging to other projects, so we need to set show_all_repos to false. However, if a given project is associated with, say, 2 repositories, then only the access to one can be controlled by this plugin, since it only looks at authz_module_name to see which repo belongs to this project.
To properly support v0.12, it would be necessary for this plugin to recognize all repos belonging to this project, by looking at the [repositories] section of trac.ini and in the repository table for this project's database.