A hook you may use to check change the user behavior you may change moderator or non moderator. Default behavior is false means not a moderator (unless admin)

<?php
function my_component_init(){
		ossn_add_hook('user', 'can:moderate', 'my_component_hook');
}
function my_component_hook($hook, $type, $return, $instance){
		if($instance->username == 'abc'){
			return true;
		} 
		return false;
}
ossn_register_callback('ossn', 'init', 'my_component_init');

Becareful with this hook.