I have a 2011 Softail Heritage Classic. I'm interested in turning on the Engine Idle Temperature Management System (EITMS). If I understand correctly this feature automatically shuts off rear cylinder at stops and auto restarts. According to my owners manual this feature comes from the factory in the OFF position.
Function. Frame sliders have a very simple purpose: protect your bike in the event of a crash. Specifically, they will come in handy in the event of a lowside type crash, where you lose traction and your motorcycle slides out from under you and down the road.
As you said, they provide protection to the engine and bike's body in case of a random drop or a crash. Additionally, it prevents fatal contact between the Rider's and Bike's body in case of a crash or a simply drop. Imagine a rider simply losing balance at stand still and falling along with the bike.