There's really not much too elaborate here. Too often whenever I play a ROC strike, there's at least one person not playing the game and expecting everyone else to carry him.
I can understand having to take a quick bathroom break or something, but when you're gone for over five minutes, then you're a detriment to the team. By that point, I'd rather you leave and let someone who'll actually help out take your place. I don't care if something comes up in real life or if there's an emergency; if that's the case, then turn off your damn console.
Like in Left 4 Dead, there should be a vote to kick option. The rest of the team shouldn't have to deal with someone who doesn't help out at all. Is such a system prone to abuse? Sure, but I think the benefits outweigh the cons.
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I think there is an autokick feature but it doesn't seem to kick in unless an idler has been reported for inactivity first. Either that or all the excessive idlers I've run into just coincidently leave of their own accord soon after being reported.