It would be nice to be able to change an account's password when the protocol/server support it. The relevant empathy bug is https://bugzilla.gnome.org/show_bug.cgi?id=576999
The relevant standard is http://xmpp.org/extensions/xep-0077.html I took a (very very quick) look at this and found that plugins/gateways.c in gabble already has code for registering a new account. Change password is not much different.
+1 This functionality seems like the only way to e.g. change the compromised jit.si password as they provide no web frontend to do this. So without a client that supports this like jitsi does (no Gentoo package for it), the situation is a little unfortunate.
+1
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