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Chris Green
This seems.... extremely unlikely. Since sshfs relies on sftp,
according to its notes at sourceforge, I don't think you can disable
sftp and not sshfs.
What are you trying to achieve? If it's shell access which concerns
you, that's a different question.
I'm not sure about sshfs, but you can set a user's shell to be scponly
(http://www.sublimation.org/scponly/wiki/index.php/Main_Page) and they
won't get an interactive shell; only sftp.