Thanks for the suggest but we choose to have different db and var because we will have a lot of sites and each site will have a different administrator. In each site, the administrator must be able to define his own sectionning, workflow, etc ... so your solution can't fit my needs.
nobody can help me ?
I know this is not an easy issue and I don't want to have all my problem solved by an answer in this forum
but I would really appreciate an advice from Ez Crew members, just some suggestions and some particular things to take care of.