Sorry, no. There is no way to advance the speed over "fast", which is really real time, the others being less than realistic time for movement and reactions. All I can tel you is that you should be grateful that the default battle time is 15 minutes. In the previous CC games the default was 30 minutes. When in a choice defense, there was always plenty of time to go brew a cup of coffee, walk the dog, make dinner, or pay attention to the wife (in this case always keeping one eye on the monitor to ensure that the AI didn't suddenly get brilliant - CC is a jealous bitch).
C'est magnifique, mais ce n'est pas la guerre.