To create a web forms survey that allows anonymous submissions, add an .htaccess file with the following contents to the subdirectory that contains the survey:
By placing this file in the subdirectory, the contents of the subdirectory are not protected by WebAuth (and therefore anonymous).
You can share administration of your form by giving others access to the directory in AFS where the form is located. When someone has administrative (admin) permissions, he is allowed to see, change, and move files. You can assign administrative permissions for the AFS directory that holds your form, but not to a single form.