Our company will send documents to be signed by the same person every once in a while. We should be able to store email addresses to use for future Sign request instead of having to go search and import the email address everytime. Also, there does not seem to be a way to extend the period of time someone has to sign the document before it expires. We need a way to extend that period before the request expires. If Sign has these feature, it would be as good as any other service like Docusign or Signrequest