Yes. Perfectly possible...just need to make copies of the 'files' module file, then give it is name (as per docs), then out a different users file in the second copy. In the virtual server you can then call the copy of the files module that uses that different file.
Personally I'd just use one small bit of unlang eg if(%{Called-Station-Id} ~= /:ssid$/i && EAP-Type = EAP-TLS) { access-reject } (example quick code!)...this assumes the request coming from the AP/controller has the SSID embedded in it..... alan
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