[Chris M]

The reason for the specified templateset is purely because, if that is your main Template Set, I am presuming you don't want it to be able to be deleted by anyone, including yourself

To protect styles from being modified, Find:

// ###################### Start Update #######################
if ($HTTP_POST_VARS['action']=="doupdate") {

Add below:

if(($styleid==X) and ($bbuserinfo[userid]!=Y)) {
    echo "<p>You cannot edit this Style!</p>";
    exit;
  }

(change X to the styleid, change Y to your userid)

@Mist - Thanks

Satan