Dan
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I think it is partially based on weapon accuracy and headshots. If you don't shoot then you don't have bad accuracy - even though 0 shots fired should equal 0% accuracy - so if in theory another player fired their weapon but missed the target, they may be graded worse than a player who did not fire at all.
Edit: @Dan Yes, the double barrel shotgun and the compact rifle can both be fired from a motorcycle or bicycle.
But can the compact rifle be fired from a bus?