Hi pgergios8,
Khan Academy Support Community is always appreciative of feedback and suggestions on course content.
Though to create course content at this time you have to be a partner which you can see in this article here
https://khanacademy.zendesk.com/hc/en-us/articles/202845420-How-can-I-or-my-organization-partner-with-Khan-Academy-to-create-content-

Also we have exciting news that Teachers will have a new tool that will allow content created that follows Khan Academy lessons while development is still in the works and no date in place If you're a teacher Khan Academy is always happy to hear feedback.

https://www.edsurge.com/news/2017-04-25-khan-academy-s-new-teacher-aid-tool-goes-for-a-test-drive-in-southern-california

Proud to be a Khan Academer
Katrina