This is true but there are only a few maps that allow a long range gunfight. Even so, you could probably get kills from acrossed cradle with a klobb pretty easy seeing as how it only takes one bullet. Yes, the individual weapons still require some sort of different skill to use in LTK, that difference is just far too small and since most maps are close combat it doesn't even matter. An automatic weapon is likely to kill you as quickly as any other automatic weapon, even a klobb, in LTK mode.
I can do with the 4 to 1 kills fix, it's not a horrible idea, I just believe that specific weapon skill should be payed attention to. Hell, you could make it 6 klobb kills equals 1 normal kill and 2 RCP90 kills equals one normal kill. SOMETHING to differentiate between the skill it takes to use a particular weapon.