This is possible using a single user account. You would create a template forms with all of the common fields. You would then duplicate the form and customize the copy. If needed you could set the company that the form is created for as a Co-author. In this way they can control opening/closing the form, edit the form, and view/edit the responses. If this is too much control, you can share the form with lower permissions. To find out more about sharing see article http://forums.adobe.com/docs/DOC-2462.
Software Quality Engineer
Adobe Systems, Inc.