We need to clean up the code a bit, I think there's a memory leak in the program. (If you have it on for a while, your computer slows down.) Also, sometimes it won't let you load fighters for your combat simulation (resetting them to zero).
It doesn't let the defense in a naval battle have more fighters than it would be possible to fit on its carriers, if that's what you mean. As far as the memory leak, could you be more specific as to what you do when it happens, and what the memory/cpu usage are? I tried keeping it open for various battles, and it stayed around 30MB mem usage and 0% cpu when idle.
If you see any other problems or lacking capability to run battles a certain way, feel free to give more input.