@Kevin

1: is it possible to use piklist_save_field-{$scope} for this?
if I were to set all fields in the form to the same custom scope – for example myscope would Piklist let it through, sanitize and verify the fields and then fire piklist_save_field-myscope where I could do with the form data whatever I want?

2: would uploaded files work this way too?

3: isn’t the action name misleading – shouldn’t it be piklist_save_fields-{$scope}