Question about the challenge editor

[RezAblorde]

I have been playing Test Drive Unlimited 2 with the unofficial patch for a while now. I'm loving it, especially because the patch adds Lamborghinis. However, there are no events which you can play with any car of your choice. For example, the Koenigsegg can only be raced in the A1 championship events, which are only in Hawaii, meaning you can't race it in Ibiza, unless you challenge a free roam racer. Free roam races have limitations. It is difficult to find a particular type of car to race with on a particular part of the map, and there was always traffic. These worries were brought to an end when I discovered the challenge editor. It allows me to create custom events which I could play with any car on any part of either island. However, the closest way to playing these challenges was test driving them, and they were always during the day in clear weather. Also, I couldn't create races with other cars. Only time, speed and speed trap challenges. Is there any way to go about all this? Thanks!