I wired my personal 3 ways at home and have had many customers request: both down = off. The problem is, now it bothers me if both are up for off - I catch myself turning them both down for uniformity (I think I'm not OCD.). I suspect those customers run all over their houses turning all their three ways down - completely defeating the convenience of them.
the easy trick is to reverse the orientation of the travelers, using common as reference - it seems to work no matter the switch brand.
what I really wanted to do was an RF programmable system, maybe next year.
