Site Switcher missing for read-only logued users

However (cf parent JIRA) the site switcher is missing for logued users in read-only live mode. Being able to switch more easily from one site to the other would be quite nice especially if some customers tends to use Jahia more as a social and collaborative site factory (aka one virtual site per "project" or per "virtual space").

Then read-only users should be able to easily access to the site they are "subscribed" to. For the moment Jahia is not managing any kind of site subscription. But we could say that as soon as a user has some read permission on a site we could list such sites in his toolbar. At least the toolbar would then make some sense for read-only logued users.

Question: do we list only sites with a direct ACL to this user (or to a group he belongs to) or we also list all indirect sites available for the guest user? As some customers are managing hundreds of public web sites, I would be in favour of only listing sites that such a user explicitly have some privileges (so without including guest user). The fact of adding such a user or a group he belongs to to a site would then act as a kind of subscription process and could be quite easily handled programmatically (if someone wants to add a "Quick Add a New Project Space" button within a template).