Fo my planes "In" is on, or "Back" is on. I'd WAY rather have an accidental switch in the car (where no one will get hurt) than on the runway or in the pits (where someone could get hurt or killed). I don't make tons of money, but I can afford to buy a battery if I accidentally kill one by bumping a switch. I couldn't live with myself if I hurt someone because I was concerned about buying a new battery pack.

Just a few weeks ago I pulled my Fun51 out of the truck, gassed her up, turned on my Tx and my surfaces all glitched. "Crap". Back to the pits and on the quick charger for a fresh charge. No harm, no foul. Conversely, a few weeks before that a guy was running up his Extra in the pits, had his Tx in one hand and was holding his plane on the ground with the other. He unhooked the hold-back and slid his hand along the fuse to get the tail so he could walk it to the line. Somewhere along the line he bumped the switch and the engine went Huevos to the Wall. He didn't have a firm grip on it and it went zooming toward the pilot stations. Fortunately there was a chair right behind the pilot that the plane was homing in on and it caught the prop. There was a nasty nick on the chair, but no damage to life or limb. The post-mortem showed that he had his switch set to Out=on. After that there was no doubt in my mind which was was safer, and safety is the cornerstone that allows us to continue doing what we love.