Multiple accounting copies

Hello, I am planning to move from a Sun/SBR installation to Freeradius, and so have a lot of things to test before... For exemple, I need to proxy accounting request from my freeradius server (2.0.5) to several (at least) radius services to allow third party applications to be aware of services allowed for every user. I have read that directly proxying to multiple server is not allowed by freeradius and instead i have to log to a detail file and then create a virtual server that read this file and behave as a NAS. My question is: Is it possible to have multiple virtual servers, each proxying to a specific radius? If not can i achieve this with freeradius or do i have to look for something else.