1. As far as I know you can lay on the ground waiting to be revived indefinitely, so long as nobody finishes you off and you don't choose to respawn. Fair warning though, the self-revive ability has a long cooldown time.
2. Hip-firing is very effective out to medium range.
3. Pretty short, but the shots don't seem to mysteriously vanish like they do in CoD.
4. No clue.
Complimentary turtle: :turtle: