Prevention of Operator Error with RTL

This may be discussed somewhere but couldn’t find it. A friend of mine was going to try and fly my quad with Arducopter 2.6. He mistakenly had the Turnigy 9X switched to mode selection RTL when he armed my quad. It took off uncontrollably and experienced a massive crash into my house.

I am curious if there is a setting somewhere that can help prevent such catastrophic results. I am pretty sure it won’t happen again but was just curious. Thanks so much.