While waiting for an answer from an admin, you might want to look at this conversation.
http://exlevel.com/forum/index.php?/topic/233-add-the-option-for-leaf-thickness/?hl=leaves
By the way guys, try to avoid using internet explorer unless the site won't load if IE is being used. I would say use Chrome as a primary browser and Firefox as back up. Chrome has issues occasionally on sites with heavy flash.