I would suggest that if there are people camping constantly that you do one of two things
1) Try and get ahold of a BFM member on Xfire.
2) Attempt to politely ask them to stop camping, and advise them of the rules.
In reality, you going around and picking up the sniper rifle to kill a camper simply stops you from racing as well, and this will make somebody say "well if he can camp, and this other guy can snipe, than I should be able to chase kill!" and it just gets worse and worse.
The best option is definitely to try and get an admin when there are real problem players.
I hope this helps
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On a side note, welcome to the forums!
Regards,
Hydra