Microsoft has published a new site for Customer Feedback Microsoft Access Web Apps:
User Voice - Access Web Apps
This site allows the general public to submit comments, requests, and feedback and will be monitored by the Access Development Team.
Please visit and submit your requests and suggestions for features you'd like to see in the future.
A second channel is available for client-side Access as well:
User Voice - Access Client Apps
You are limited in votes, so think carefully before submitting.
MS Access Topic Adviser.