1. Once purchased are the security levels for backend users. We need people to have access to web submission info but we don't want them deleting info or forms for example.
2. Do all the formcentral functions work on iPads?
#1 - This FAQ explains: http://forums.adobe.com/docs/DOC-2462
#2 - The main FormsCentral application (were you design your form and see the responses) is Flash based so it won't work on an iPad. The forms you create are HTML based and those can be filled out on an iPad (or any device with a web browser)
Great! Pertaining to question #1, do the "Contributors" and/or "Readers" have the ability to export a single submission as a PDF?
Yes - a "Reader" or "Contributor" (of any account level - Free, Basic or Plus) can export a submission response as a PDF.