Batman: Arkham Knight is a great game — as detailed in our 10/10 review — but it's got one really puzzling design decision: Rather than using the left trigger to cause the Batmobile to brake, it's monopolized by the car's tank form. And we do mean monopolized: You have to hold it down the entire time you're in Battle Mode, which is cramp-inducing and just plain weird.
That is, unless you hop into the game's settings menu and opt in to the Battle Mode Toggle. This one change moves braking to the left trigger (as God intended) and makes Battle Mode something you activate with R1/RB. One weird thing: You can't activate the toggle until after your first visit to GCPD, but you should switch it instantly after.