Are you interested in requesting a new feature for Dreamweaver, or any other Adobe product?
First of all, read this excellent article by Garrett Dimon (that I found on John Nack's blog) about suggestions for making feature requests. As someone who regularly reads Feature Requests, this article hit the mark on every point.
Then use the Adobe Feature Request Form to submit your request to the appropriate Adobe product team.
Thank you in advance for keeping the great feedback coming!
