Following the theme of blending FPS with MMO, I would recommend a way to allow 1v1 fights while in patrol mode. Inspecting a player could have a 'challenge player' option, not unlike a friend request or invitation to fireteam. If the challenge is accepted, both players will be able to deal damage to each other. It could either be on a timer like in Crucible (with most kills wins) or a single kill wins. Thoughts?