actually there is some truth to what he says. heating the springs hot enough to bend them easily will change the tensile strength of the metal, which changes the spring rate differently based on how much you heat the metal up, making it so that there is no way to get the stiffness of them equal. cutting springs usually removes the dead coils and "progressive" coils of the springs, actually making them stiffer in a pretty even fashion if you do them equally.

either way, modifying the springs themselves is a bad idea. even $30 ebay coilovers are a better option.