I am a speedrunner and world record holder in almost the entire unrestricted category. You know me for the most suspicious runs in the category such as 50K in 15 minutes not power ups, or 1M in 1.2 minutes of power ups. Here I will answer all your questions and try to prove to you that I am not a cheater and all my runs are legal.

I used the mouse wheel, which allows you to increase the speed several times, and also set the maximum possible mouse sensitivity, since this was not prohibited.

are you using free wheel?

ok thx