Ok, I know what's my problem: every time i saw some customization settings they either weren't useful at all or you could adjust stuff you wouldn't even know about it existing otherwise. Or both.
My actual imagination of perfect implementation would be that there's a GUI with only basic stuff and maybe some presets you can chose from, on the other hand you can customize everything by file editing, even stuff like sounds (pls) and (intensity of the) screen shake.