Thanks for the feedback, Vengeance. We're considering adding some form of health pack in a future patch, possibly only for single-player (healing in multiplayer should really be done by your teammates). We'll have to see how it pans out in testing.
Data-wise, you always receive a proportion of the data for a kill directly - it's split between a direct award and the pick-ups, so even if you can't hoover up all the pickups, you still receive a percentage yourself. I don't have the number to hand right now but I believe it's split 50-50 between the direct award and the pickups.
Regardless, these are all good suggestions. I'll pass on your feedback to the rest of the team. We'll be updating Battlezone regularly so watch this space.