github.com/steemit/steem does not even allow suggestions as GitHub issues:

Enhancement Suggestions

Do not use the issue tracker to suggest enhancements or improvements to the platform. The best place for these discussions is on Steemit.com. If there is a well vetted idea that has the support of the community that you feel should be considered by the development team, please email it to sneak@steemit.com for review.

https://github.com/steemit/steem/blob/master/CONTRIBUTING.md