Sure. You can use aaa server-groups,
and specify one group for dial-in (sync
or async), the other for admin (telnet).
If the admin users are dialing in, you
can still specify the admin group under
the lines and the dial group under the async
interface.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120t/120t5/serv_grp.htm