Rather than ask users to submit their feature requests directly to FileMaker using a submission form, why don't you guys just add a Feature Request section to this forum?
This would be of great benefit to both FileMaker and the FileMaker community for two main reasons.
1.) It would prevent users from wasting their time typing up a detailed feature request for ideas that have already been submitted.
2.) It would allow other users to vote on the feature requests (and add their ideas to it) so FileMaker could see what features users really want/need.
Here are two good examples of how such a system could be implemented: