(1) obviously with distanced traveled will not always be an equal 12 hours interval..that was just an example. What you would do is a lil math to see how many hours you needed to advance so you can reach your city at the right time.
I haven't tested, but could it work if you fast traveled to your city and/ or leave a building in a city that is attacked to mark the time ;; reload ;; and advance time in the previous place and adjust accordinaly so that when you do try and travel again it will be about midnight and hopefully the towns people are in bed and casuitys can be to a mininum.
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I've re-rolled a few times cause I can't decide if I want to join the DG or Vamps and I've had the game about a week or so and just now started to encounter frequent attacks. So I'm wondering if some people just have bad luck starting a new game with more frequent attacks than others.
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Also I know dumb questions deserve dumb answers and in hindsight things can be different, lastly you can't please everyone especially when everyone is on such a grand scale....HOWEVER!!!!!! how hard would it be to make a menu option for random dragon / vamp attacks?? Cause honestly sometimes I want to boot up skyrim and be a simple huntsman. Having a dragon appear when I'm lining up my elk kill shot is very rude.