Licensing issues are often complex when designing CRM solutions and I have strange attempted workarounds with proxy users and simlar and often the issue has been that the sales people have not had the technical insights enough to know the inplications of the licensing setup.
I recently saw I nice blog entry with a summary of CRM licensing. Do check it out. http://markmargolis.wordpress.com/2013/03/04/microsoft-dynamics-crm-licencing-simplified/
MVP, CEO and owner at CRM-konsulterna AB