When using Combo Box for an association, if the user types in a search term and not results are found, provide the ability to easily create a new entry in the associated table and add that new entry to the association being maintained by the Combo Box. Currently, this is do-able, but takes quite a few steps including the use of a page parameter, a nanoflow (to save the entered search criteria) and a button in the control area of the Combo Box.
I think this request might fall out of the scope of combo box.
Like you say, it's possible with a page varaiable, hook up the value and then use a nanoflow to create the object.
For a simple object like a "tag" it makes sense, but for more complicated objects (require more than 1 attribute) the widget UI would not be able to handle it? Or do you see a situation where it could?