The feature-request/bug-report form is the absolute best, most effective way to communicate with Adobe about feature requests and product bugs. The Audition team takes your feedback seriously and reads everything you submit there.
The Adobe Audition user-to-user forum is great for asking questions about how to use the software. Before posting a question, first do a search to confirm whether your question has been answered before—many have.
If you need one-on-one assistance, see this page to contact Adobe Technical Support. (Note that you must register your product before you can open a technical support case for it.)
Lastly, if you’re still running Audition 3.0, be sure to update to 3.0.1 to get the very best performance out of the app. This quick download fixes a wide range of issues that customers reported using the bug report form above. We’re listening to you!