All farmOS development tasks, feature requests, bug reports, and general planning/discussion takes place in the Drupal.org issue queues.
farmOS is comprised of many projects, and each has its own issue queue. If you aren't sure where a particular issue should be posted, just add it to the farmOS Distribution issue queue, and someone will move it to the appropriate place.
If you're a Github user, you can also feel free to post issues in the Github queues. They will either be addressed there, or copied to Drupal.org and integrated into the roadmap.