I can see that there is mention of a
'passwordreset' permission in the
Mediawiki code, and it looks like a special page already exists to allow
password changes. However, I cannot get this to work - setting the
permission and logging in, I see no special page relating to password
changes. Could someone please let me know what is required in order to
see this special page?
http://www.mediawiki.org/wiki/Manual:Resetting_passwords might give you some pointers.
hth
Frank