If you've ever tried running PS1 games on EmulatorJS, you've probably noticed something… missing. Out of the box, EmulatorJS doesn't map L1/L2/R1/R2 in its touch overlay for the PSX core. That's fine for some titles, but the moment you boot anything like Resident Evil 2, those shoulders suddenly matter a lot. Google around and most posts say the same thing: "Use a Bluetooth gamepad." That's a great option—until you're on a phone, on the couch, with no controller in sight.