would be simple enough, like just put the following code in whatever hook you want to take action for
PHP Code:
$amount = '1';
$vbulletin->db->query("update " . TABLE_PREFIX . "user set {$vbulletin->options['icashf']}={$vbulletin->options['icashf']}+'{$amount}' where userid='{$vbulletin->userinfo['userid']}'");
for example giving points on arcade champ would be the hook ibproarcade_new_champ