Hi,
I’ve just done a hack for this, it’s not great and I’m sure someone can come up with a better one.
Here’s what I did:
Removed line 85 form bp-tinymce.php
unset( $initArray['editor_selector'] );
This now says that for the editor to display it will need the class ‘theEditor’.
I only wanted the editor in the forum part of BP so I then added that class to the textareas in form-topic.php & form-reply.php.
I guess if you wanted it on comments it would be simple to add that class to your comment form template.
I’ll probably look more into this when I have a bit more time.