I’ve always wanted to incorporate a steering wheel into a handheld gaming device, because I don’t enjoy nudging a d-pad or analog stick for the entirety of a race. The wheel allows for a more fluid control scheme, and possibly a more relaxing experience while playing. Unfortunately this device would be exclusive to racing games!
This handheld was inspired by an F1 steering wheel, notably the carbon fiber body and colorful buttons. The wheel is embedded into the device, both thumb grips are joined by an arm that rests behind the screen. The shoulder buttons are the accelerate and brake inputs, and there are paddles on the back for shifting (not shown here).
Went with SEGA because they have been dipping their toes into making hardware again, plus they have an extensive catalog of racing games: Out Run, Hang-On, Daytona USA, Sonic Team Racing, Sega Rally, and Virtua Racing to name a few.
Force feedback and rumble could be incorporated, but that depends on the games included (if they are all retro it wouldn’t be worthwhile). One must-have feature would be to link up multiple devices for multiplayer racing, where many of these games excel.