At the moment no, but you should create a dev board to test any new addons before installing them on your live board. It's allowed by the XenForo licence providing you're the only who can access it and it's protected by a htaccess login.
I don't understand. The Bbm has an helper both for TinyMCE Quattro and XenForo Redactor. The system is just a little different because XenForo redactor is using a sprite whereas TinyMCE is using vectorial font icons (see the FAQ of TinyMCE Quattro for more information).