If there's a team faking injuries systematically so that they can have a drinks break and a team meeting (like Stevenage under Westley or, it sounds like, Southampton this year) - then what it's going to take is a referee brave enough to ignore them and wave play on. The nonsense would soon stop if their opponents pinged the ball into an empty net because the keeper was sitting down on the edge of his box, and the rest of the team were huddled at the sideline enjoying a nice gel capsule!
(either that, or they'd just get really good at faking head injuries. Would have to go consult with Dean Richards from his Harlequins days)
Just adding the time on at the end isn't enough because it's not just about time-wasting, it's also about breaking up the flow of the game.......