Hornby

Not quite manual transmission (I don't really want to press a button every time i gear change), but make the keyboard respond more like a controller. For instance if you hold the trigger of a controller half way, the car will maintain half speed. In the case of keyboards, this is not possible because as soon as you press W or S it immediately wants to be full speed or fully stopped (I find this causes a lot of traction issues with tires spinning/skidding off of light gas/break taps). Instead, my suggested mod would be similar to how one drives a normal automatic car. You hold down the gas until you achieve the speed you want, then you can release the key with the vehicle maintaining a relatively constant speed. Same goes for braking. If you hold the S key for a split second, it will act as though you are lightly touching the break pedal - unlike how it currently is where pressing S for a split second is the equivalent to slamming your foot on the break for a split second. 
I'm not sure if that clarifies my request anymore or not.
Thanks =)