Re: tikipedia registration
Since the log-in box itself has a link to tiki-register.php, you could just modify the "login" link to say "login/register". This would also be close to the Wikipedia procedure, if consistency there is important.
In templates/styles/tikipedia/tiki-top_menu.tpl, line 7, change
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{tr}Login{/tr}
to
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{tr}Login{/tr}/{tr}Register{/tr}
-- Gary