I'm not entirely sure if the "ping" thing works on allied CPUs, but if it doesn't I was thinking maybe there could be a command to tell your CPU ally/s that you're under attack and need help. I rarely would need help but there are times when an unexpected (and huge) attacking fleet attacks one of my planets and destroys everything. (and actually from my last game, pirates then cam right after them...so I had two attacking fleets. 
)
