I have recently done something very similar at a customer site. On a remote access server we configured it to use TACACS for exec control and to use Radius for ppp. In our case we are using different servers but I do not think that would be an issue. We also are generating aaa accounting records for the ppp sessions and sending the accounting records to the TACACS server. I have not had any particular problems with getting this to work.
HTH
Rick
HTH
Rick
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