hiya, how about having a look into the MySQL, i havent played with phpbb for a while but there use to a whole load of binary configaration fields, i have found before that there is a master HTML allow / diallow, and this was only able to be changed by directly editing the database.
I hope this helps..
jammie
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<?php
$lion = "constant";
$lil_lion = "escape";
$baby = "dum dum, babo";
$jammie = $lion."sheepy and my comforts";
$jamie = $lion.$lil_lion.$baby.$jammie;
?>