we've done this a few times, and it's been a fun exercise -- normally we would make this a request queue and each survey would be submitted as a request.
however, as part of doing the exercise, and having fun, we've also come to the conclusion that for the most part it's not really a good fit to have the survey be in workfront (for us). These surveys are never anonymous, they're largely unused, they're not really a work item, and they often don't tie to anything in the system. Also more to the point, the custom form often provides a weird experience because you can't really format it like you would most surveys. If it's at all feasible, there are other survey solutions out there that would be better.
