[Logician]

not tested, give it a try:

edit admin/functions.php, find:

PHP Code:

if (!isset($sigcache["$post[userid]"])) {
                $post[signature]=bbcodeparse($post[signature],0,$allowsmilies); 


Replace it as:

PHP Code:

if (!isset($sigcache["$post[userid]"])) {
if ($post[usergroupid]==6) 
{
$post[signature]=bbcodeparse2($post[signature],1,1,1,1);
}                
else
{
$post[signature]=bbcodeparse($post[signature],0,$allowsmilies);
} 


it should do the trick for both of your requests