"Random" vs. "Fixed"

That's why I want to try to improve the random map generator, if that's even possible. I need to somehow extract the necessary files, but I don't know how or which ones to extract :confused:. Maybe someone can help with some advice?

There's no need to extract anything. Find the file rmg.txt and edit it to your liking - it contains descriptions of all the templates for the generator. Here's a compilation of information about various templates, which might be useful to get you started... :) I guess that if you want, you can create quite a few of your own templates.