Many, many features but unfortunately Apple put such a stranglehold on their hardware and software to keep it away from pirates and viruses it's hard for developers to make things useful on a Mac. Get a normal PC and get Linux on it. That's the best advice I could give you.
H2H is a feature where you can change your tactic as you go along in 15 minute(game time, not real time) intervals throughout the match. You can make substitutions, switch players around in positions and sometime soon, talk to who you are playing against.