oh god, we would need a slider that would increase for pressing W and some other stuff so people dont take off with the highest gear and speed at 120bps
That's not how it works. The highest gear has high speed and low acceleration. The lowest gear has low speed and high acceleration. Moving through the gear sequence, you take off fairly quickly, but it takes a while to reach top speed.
If you start on the last gear at a stop, you barely move. In a real car you'd probably stall the engine.
In Blockland terms: The first gear has high enginetorque and low maxwheelspeed. The last gear has high maxwheelspeed but low enginetorque. You only gain the advantage of a higher gear if you shift to it from the top of the last one.