This doesn't seem to be specific to teachers at all. How about these instead (off the top of my head)?

1. Don't try to teach those who do not wish to learn, or students who did not choose to attend your lessons. It's a waste of time and will make them hate you and the subject matter.
2. Choose your metrics carefully. Treat exams and other common tools as a cached thought. Remember your students will always optimize the metric you choose, not the one you had in mind.
3. Know your goal. "To teach someone X" is not the same as "to help them earn a degree" or "to comply with mandatory education laws". Goals are arational, but do not be confused about yours.
4. Fill in this commandment, due next Monday.
5. If you do not know the answer, admit it freely, but be prepared to learn and explain it during the next lesson.
6. Unless teaching children or unwilling students, you should not find yourself spending time on "discipline".
7. If in doubt, tell your students to read the Sequences.
8. Both you and the students are allowed to have fun during lessons. This doesn't make them less "serious". Most people have trouble concentrating; find ways to help them.
9. If your students are "cheating", it's not their fault: you are not providing them with the right metrics, incentives, and rewards.
10. It's OK to only have 9 commandments if you can't think of a worthwhile tenth.