I just wondered if you managed to get an answer to your question as I too am trying to find a web survey plug-in or solution.
I would really appreciate it if you could let me know how you got on.
I'm wondering the same thing.
I've found this example using WebDirect: http://www.filemakertoday.com/filemaker-13/4035-filemaker-13/using-filemaker-13-webdirect-for-registration-or-creating-a-survey
I don't currently have FMserver. Downloading the trial version is an option, though perhaps this is infrastructure overkill if all I plan to use it for is hosting a web form?
Thanks in advance
Using FM13 pro advanced