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It seems that the specifications explicitly forbid the use of ENABLE before auth :

The ENABLE command is only valid in the authenticated state, before any mailbox is selected.

Maybe the login phase should handle UTF8 natively though :

Characters are 8-bit UTF-8 (of which 7-bit US-ASCII is a subset), unless otherwise specified.

EDIT: defaulting to UTF-8 is an IMAP4Rev2 thing. But it looks like some servers advertising rev1 are supporting utf-8.

OK I feel silly, it looks like everybody is using AUTHENTICATE to bypass the UTF-8 limit and I was not aware of this. I'll revert my changes and update the documentation with a plain auth example.