Tasks created using the "Report a bug" form (https://phabricator.wikimedia.org/maniphest/task/edit/form/43/) have a "BUG" label. (For example I'm creating this task using that form.)
This label, as far as I can tell, can not be added or removed in any way after a task is created. In particular, it's impossible to remove it from a task which a user filed as a bug but is really a feature request.
While this feature might be valuable for carefully managed, small workboards, it seems like for the more common case of huge unmanaged backlog, it will only create more noise in the interface.
Until editing this label is possible, I think we should hide this form from the "Create Task" dropdown, which is easily accessible for all users (including newbies filing their first tasks).