I made a post awhile back. Check that out it really works!
Just a bracket next to the switch, I have yet to accidentally change the settings with this in place.
It protects any accidental changing of the toggle position, you have to want to change it.
It is also extremely easy to do and does not involve modding the case or anything in any way.
I also put on on my Start/Stop button. You have to hold that 2 to 3 seconds anyway so is not really needed there but I liked the way it looked. ii