Most/all of these "whoever holds mid" and timer ideas blow because for every punishment you give a team for promoting a stalemate, you give incentive for the other team to force said punishment upon them by continuing the stalemate. There's not really a way to force 5cp to play faster fundamentally without practically morphing it into KOTH.
Half of the deal is teams aren't going to play super fast and reckless in certain situations when stakes are high, and your opponents are really good/can punish your tiny little mistakes. The other half is pretty much what grape juice said; if both teams suck at breaking stalemates the games not gonna go anywhere.