Add an optional "Advanced Driving Model", simliar to the "Advanced Flight Model", to the game.
It should include things like:
Manual transmission, including reverse and idle (see this request: http://feedback.arma3.com/view.php?id=14566)
Direct gas control (no auto-brake when going downhill)(see this request: http://feedback.arma3.com/view.php?id=908)
Separate brake button (the current brake button is actually a handbrake)
Turn signals with hazard flasher function
(Possibly windscreen wiper (either as buttons or only in the scroll wheel menu))
Analog gas (not speed), brake and clutch
Automatic and manual versions of cars would also be nice.
(Or an option for cars in the new 3D Eden Editor, or via script.)
Karts (and bicycles http://feedback.arma3.com/view.php?id=21853) would have sequential gear.
Additional difficulty settings (all gear options/only specified, clutch yes/no, fixed automatic/sequential/H-shifter, fishtailing etc.), similar to the "Advanced Flight Model"
Improvements to vehicle behavior and improved realism woul also be appreciated.
Some features, like turn signals and windscreen wiper, could also be available in the normal driving model.