I don't think it'll influence the objective players, the so called "hard-whorers" will be penalized, of if you just medic your teammates and supply them with ammo, there's not nothing to worry about.
XP Bonus for objective might be possible, but that will be something serverside for sure, something we can not influence unfortunately.
I think teamplay/fun is the most important aspect of the game, I'm playing for fun only to, but still, many people will play for rate and if they'll stop just because some other drop packets only in spawn - it's eventually bad for both sides. There will be clear rules what's allowed and what not, and there will only be 1 not-accepted rule at start (with some video's what's not allowed to make it more clear). If any problems will come up, it'll be changed of course!