Skidmark.gm6

I am in the process of making a skidmark example, and I want it to be the best example possible - and that means good skidding. I've hit upon a way to make the car skid realistically, but unfortunately the car does not work properly in reverse.

All of the code is commented on what it does.

As you can see, the car moves forwards properly, smoothly, and realistically (for a GM game).

What is neede is movement backwards, of that style. Unfortunately, I have tried many things with no avail, and the reverse-problem persists. I currently have in this version the only semi-working reverse solution - but it is only a half solution, for as soon as you release down, the cars direction swings to the front. And also, sometimes if you hold brake while reversing, it starts moving forwards, instead of backwards.

So if anyone can fix this problem, you have my deep gratitude.