What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
No this is not possible, I see you have added the configurable list widget, the user will need to click on the button to dynamically add more if he wants to:
On regards of Salesforce, yes you can integrate to SalesForce, please check this guide: http://www.jotform.com/help/271-Flexible-Data-Integration-with-Salesforce