As reported above you can simply disconnect the cable too to disable the light. I might look at printing a couple of rubber plugs to keep on the ends for this purpose.
Hey spicker. If you end up printing some plugs for the light cables I'd be interested in buying some from you, cover S&H, etc. this is a great idea.
Appreciate the info in this thread, I got a 906S wired-up last night on my Levo. works great, glad I learned about enabling the e-bike mode here. I will say getting that wire run through the frame was a chore!