I have a question about finding values and which aspects can be changed....

Jump height - I noticed another save editor (I think it was Call of duty) has a jump height modifier, is that something that can be created for any game where jumping is involved? Or is it just because of the way jump height is handled in COD? I'd like to make jump height mods for games like Disney Universe, THP8, Toy Story 3, Sonic, Spongebob, Halo, etc...