How can I add my js file on widgets.jotform.io domain to have possibility to manage form/iframeWidget?

How can I add my .js file on widgets.jotform.io domain to have possibility to manage form/iframeWidget?

or how can I create not iFrame widget but with needed widget settings?

I believe that this is not possible, but I have forwarded your concern to our back-end team to get a more accurate answer. You will be updated via this thread.

Ok, waiting more details.

Note: your example widget is not working here: http://developers.jotform.com/widgets#customfieldtutorial