I would like to see races, where you have to pay a fee to get in, and win all the money.

Before the race you get to choose between the a few car models ( and you don't know the car's stats it is a surprise every time ) - Mad MAX 2 style cars

---------------

Maybe destruction derby mode too

I really like the idea but I'D suggest one addition: Fuel is a very scarce resource in the world of FO. So why only bet money on it, when you could make having the required amount of fuel a second condition for entering a race. The same might be possible with replacement parts, etc. Maybe you could even be sponsored by other people with fuel and parts and so on, who then get a certain percentage of the price money. Or you could rent out advertising space to people who own shops in e the game and receive money, fuel and parts as payment.

Such a feature would certainly be nice. I really hope that something like that makes it into the final game.

I would say we should be able to obtain our own cars altogether. The maintainace, fuel and possible modifications would make it a great addition. We should also be able to jump in our friends car and go roam the wastelands. Wouldn't you love to shoot from a cars rooftop? : ) I would.