Hi Raphael,
I don't think changing credentials (user and password) will ever be
implemented on AgenDAV, because it just uses them to authenticate on a
CalDAV server, which could be checking them against an LDAP server/users
table/others.
However, settings like your language or your timezone will be available
sometime in the future. Can't say if it will be soon, but they
definitely need to be configurable.
Regards.
--
Jorge López Pérez
http://adobo.org