Migrate from Mnesia to MySQL?

Hello, it's me again with a new problem/question.

Is it somehow possible to migrate an existing ejabberd database from Mnesia (internal) to MySQL? With everything possible (currently: auth, roster, vcard, offline, last - did I forget something?) Well, at least userdata, vcards and roster should be kept...

I tried the following steps(with V 1.1.1):
1. backed up database, changed the config to support MySQL, restored DB
Result: works, but existing users are kept in mnesia, everything new goes to MySQL

2. stopped ejabberd, deleted the spool directory, started ejabberd
Result: Error

Errormessage (with command-line):
kane ~ # ejabberdctl ejabberd@kane restore /home/ejabberd/testback1
Can't restore backup from "/home/ejabberd/testback1" at node ejabberd@kane: Table passwd does not exist.
{"init terminating in do_boot",{undef,[{ejabberd_ctl,start,[]},{init,start_it,1},{init,start_em,1}]}}

Crash dump was written to: erl_crash.dump
init terminating in do_boot ()

3. stopped ejabberd, emptied database (while keeping its structure) because of content from Step1, restored backup
Result: Error (same as above)

Am I missing something or doing something wrong?

And, if it's not possible at the moment, is it planned to implent this in the future?

Greetz
Jan