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After reading your details and checking your form(ID-7842123998), you're looking for such a feature that the speaker's can also sign on your form, am I right?
It's possible to achieve your requirement by our e-signature widget. Under the widget section just write any part of the widget name (like 'signature'), choose anyone and drag into your form. Please see the following picture-
If you need any further assistance, please get back to us. Cheers!