Surveys would be more useful if they had the ability to utilize hidden fields / accept input data from a query string. This would allow the survey form to be personalized rather than completely anonymous.
For instance if I send survey (url) to an individual it would be nice to prepopulate data with their name, or send and ID value that is not viewed in the form but is stored in the response data so that response data can be queried rather than copying the same form for multiple category.
ie. currently 1 form = response results from surveys sent to company 1 and company 2 staff with no means of identifying which without the user entering specific information in the form (not ideal, company 1 should not know about company 2).

If you add a query string to the survey url: ...?companyID =1 the value would be stored in a results field and the data would be query able.

Company 1 = 1
Company 2 = 2