Yeah I was thinking about this too and though about timers etc. But then I realized that this is self-sorting issue. If someone choose to use an alt to pull hostility then everyone can still attack that port and flip it. That port is still open for everyone to pull hostilities on. Sooner or later regions will run out of ports to pull - sorted. Also (thanks for bringing this up as I forgot to put it in as I originally intended) - taking hostility mission should cost lots of reals. Regional port