It should at least be able to support Dynamic VLANs - so with the one SSID your users will be put into whatever VLAN they've been assigned to after they authenticate. You can then specify allowed times and access policies for those VLANs.
Locking this down to a specific radio though..... that's a good question. What you describe though does sound like a likely limitation.
What's the main reason you'd like to be able to do this? My idea about mobility is exactly that, you're mobile but wherever you connect you're limited to the usual access you've been given.
You can do location based access with the 700wl series or regular AP's, but I still prefer the WESM solution.