Nib is built by students, for students, and it gets better from feedback. Drop a bug report, a feature you wish it had, or just a thought — it goes straight to whoever's maintaining Nib that week.
Open an issue on GitHub if you're comfortable there — it's the fastest way to get it looked at.
General thoughts, feature ideas, or "this broke on my school's version of AP Classroom" all belong in the form above.