Document Form API
In !1252 (merged) I'm adding a 'render_inline' => 'n'
property to class tform_base.
The issue is that most form implementations such as interface/web/admin/form/remote_user.tform.php have a copy of the comment that explains the possible properties ... but these are not in sync.
To promote a single source of truth I suggest to update the one in tform_base.inc.php and replace the others by a reference.