Is there a page for cs50 feature requests? Is there an interest for curriculum suggestions from fellow educators?
If you visit Harvard's CS50 AP site, you'll see a link in the sidebar to the AP Educators discussion group. If you're an educator using (or thinking of using) CS50AP in your own classroom, that's probably the best place to go. There is also a CS50 Educators Facebook group that may be of interest.
For suggestions about CS50 in general, the main CS50 Facebook group is probably the best place for that. Alternatively, you can email email@example.com to contact staff directly.