So....... You're trying to make an argument for Thud not being considered cheating?
How ridiculous is that?
You're right it's more than just map-hack, it also lets you know probable locations of shrines, monster affixes before encounter, et cetera. Yes, clearly those things don't give you an unfair advantage, not intended (read as sarcasm).
Lets also not forget that this unfair advantage saves precious time while hunting down elites, or moving between floors, or, or , or... You get the point.
But the worst part is that you're probably not even on the 1000 spot leader board and still cheat, and that's sad.