It would be a nice feature if Surveys could have an expiration date (and time) so that we could put out a survey and have it automatically become inactive on a certain date and time. This would allow us to reliably tell people you have until such-and-such a date and time to reply to the survey.
In addition, it would be a nice feature if when a survey "expires" and pre-defined (for that survey) list of people could be emailed the results (or perhaps, optionally, all who replied).