There is a Contact Us link on the main http://www.autodesk.com. From that link you can naviugate to where you can provide feedback on the Autodesk.com website or select the Products. and provide feedback on Autodesk products. These forms when submitted go direct to the products teams. I can speak in the case of AutoCAD that many of these are answered and all are read by the key product team members.
Options on the Contact Us page:
- Product Help
For help with your Autodesk product, a number of free and fee-based options are available. - Feedback
We’re interested in your comments and ideas and like hearing from you. Share your thoughts and suggestions about Autodesk products and services, or submit a product wish. - Locate Offices
Here's contact information for Autodesk® offices worldwide. - Phone Numbers
Can't find what you need online? Find out how to contact Autodesk or an Autodesk Representative in your area for more help
There is also an online bug report form for Autodesk products located at http://www.autodesk.com/submitbug