[[mw:Manual:Parameters_to_index.php#Edit_and_submit]] could use a little updating, but more importantly, there doesn't seem to be any appendText and/or prependText to be able to add a post to the bottom of a section on a page. Please add this (maybe similar to [[mw:API:Edit#Parameters]]).
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=53152