1. I wasnt addressing jumping of walls as much as free running in itself.
2. Making NPC AI behavior that would make them pursue you would be a nightmare for Bethesda and kill much of their precious time. Short of torching the roofs there isnt much they can do if you're hiding on the roofs and they cant pursue you. Even games like AC, which are more or less entirely based on free running and have architecture which is waaay more easily to navigate, have problems with this (how many times havent you laughed at a guard for failing at climbing due to some minor glitch or just takes such a stupid path that it takes him forever). Its just not a viable option even if it had any actual place within the game, which it doesnt.
Seriously, you can't really expect Bethesda to add this to Skyrim, its just silly and doesnt belong in the elderscrolls series (atleast for the moment).
I really don't know where to begin.
Well, from start I guess.
First of all, it's not silly and fits TES perfectly.
You fail to see that only because of your ignorance and narrow view on things.
Anyway.
All those problems about climbing on a platform where NPC's can't reach you are problems present in the game even without advanced acrobatics and Bethesda should work on solving it.
Advanced acrobatics would not make that case worse in any way.
There are simple ways that can solve that problem only if you think about it a little better and is not nightmare at all.
Also, all that precious time killed you are talking about would be actually time well spent. >.>