Actually you're right, with Futaba you do have to set the failsafe to kill the optikill, same way you'd set the throttle position or anything else, or when the RX looses power it will shut down. Sometimes you're lucky and when you plug things in the default setting are so it will shut down. Depending on what Rx channel you use you make have to set it manually though, I found this out by surprise while in my p-47 I had it on the flap channel, it just held position when the Tx was turned off.

I was talking with my Buddy about how to bind JR/spec

I guess the only potential down side is if you swap RX with an already bound RX for some reason, you have to remember to re-set your failsafes,, with futaba the TX tells the RX what to do constantly or on power up?? Both systems work fine I guess