Generate signature certificate when not all recipients have signed
When some, but not all, of the recipients have signed a document. It would be great to be able to close the document (no more signatures allowed), and download the document with the signatures thus far AND have a certificate for those that have signed. This would enable a document to be completed without having all of the required fields completed, allowing for alternative methods or dates for signatures, or even electing a new recipient to replace the ones that didn't sign the first time. This ensures those that have signed will not have to sign the document again, saving everyone a lot of time.

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Pierce O'Shea commented
Ability to send a document to 2 different signers (husband and wife) sharing one email to sign. DocuSign allows this. This would be very useful as I have had a few elderly clients that don't have an email but there spouse has.
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Thomas Hayes commented
Ability to generate a signature certificate for partially signed documents - for example, if a document is sent to four recipients, and two sign, a certificate can be generated for the two signers.