Jason,
If I understand your question, yes this can be done. You can do this by saying "Touchtone Converstation" or by hitting 9. This will temporarily change the converstation from voice to input style. If you need to change back, then just exit and log back in. You can also change to full or brief menus via TUI by entering 423 and 1 to switch menu style.
Here is the link that explains in more detail:
http://www.cisco.com/en/US/docs/voice_ip_comm/connection/2x/user/guide/2xcucug150.html
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