Well not all ppl know how or have the time to learn to look for this stuff, but with the tweaker file anybody can change the values etc. And if you start changing the hex directly it will be alot of searching if and when one would like to undo stuff. But in theory, yes, one can change the hex directly.
To your 2nd comment. There is no program in the world that do anything by it self (maybe ufo technology :p) but there always some sad guy that have to program the software to maybe look like its doing it by it self
