i wonder if the begin dungeon could be a new a new category where you just have to finish the starting dungeon as fast as possible, the time begins when "new game" is selected and ends when you enter the open-world

So... the run would be about pressing ALT F11 as fast as possible?

Okay, I get it, you probably mean without this "glitch". But then there's the question: Are people gonna run that? Probably not. It doesn't even really contain any tricks or anything interesting. Creating ILs for a game that doesn't really have ILs usually isn't preferred or actively played, especially for such a short run.