In 1.2.6 description
-Added the ability to add new records to valuelists for select widgets inline... but only if the valuelist uses __sql__ to pull its values from the database.
was not working for me..
In Dataface/FormTool/select.php near ligne 90
I changed $widget['suffix'] to $widget['description'] and it work great now... Looks like there's a problem with the (unknow) 'suffix' directive.
It's a really realy useful ability to me ... But ... Is there a way to desactivate it for choosen fields ?