The only way to avoid having the user email shown is to someway make that the user sign out of their Google account session or to open the form in incognito mode.
This is possible, but you would have to use multiple forms.
Google forms are static and can't be edited or altered with script during a session (user opening a form until they submit it). You can't pull out values that a user has entered into a form until they have submitted it.
As a result you could have an initial form which collects all the values which would influence subsequent forms, then use a script to take the results and create a new form, (e.g. with 12 fields for the 12 provisioned users in your initial example) and then email a link to this form to your end user.
I agree with the previous answer in that you can not disable the auto-save but there are a couple easy workarounds that will allow you to work on your document while at the office.
After you login to Google Docs and are looking at your list of documents, hover your mouse over the document in question. You should see an 'Actions' dropdown appear to the right. If you click on that you should be given the option to 'download' the file.
Now you can work on your document locally on your office computer and when you are done for the day just upload it back to Google Docs. :)
The solution is to use scripts , I check the google forms script examples. Quick walk through: 1. Just create a form in google forms and add your questions. 2. Create a script on the add script page (of course google for the correct script or check the developer forum examples) 3. While the default is a spreadsheet format you can select one of the supported types (again I check the google developer examples,they're somewhat dated but do still work.)
All sorted now.
Thank you