I can't see why this game doesn't support time attacks, this is one of the best parts of games this genre. This is a great way to make the game more interesting. It's not only fun and competitive it's also a great way for building up team plays. It also connects players more in chat and makes people cooperate with each other. This will not only turn game more competitive but it'll also force people to participate in Guild chat, meaning many more players will start talking, If you think that this is a bad idea I suggest that you play any other game this genre, build up team spirit with the people you play with and go do some time attacks. The thrill, hype and knowing that you are all trying to win together, this is priceless.