Yes, category extensions will open up in the near future, but there is not a set date as of now. We will also be adding the IL boards soon.

I love this idea lol. Once you get a run, feel free to send it to me and I'll add the category.

Unfortunately no. Speedrun.com is only used for speedruns and no high score leaderboards.

Do you think it should be changed that only the first unlocked cars should be allowed in the rookie season?

1. When are the start and stop times for the timer? I started mine when I pressed continue when it told me i had no memory card and ended when final loading screen showed up. If you need, I can post the video on my YT so you can see.
2. Load times are much slower on PS2 so should it be IGT?

1: Can this be run on PS2? 2: Is there a 100% category for all characters?

Yup! All platforms work.