I really enjoyed that season too. I like how the first seven episodes each had call backs to a previous seasons (i.e. episode 3 featured the league of assassins, the main villains from season 3).

Yup. I think 10 episodes. Most of the season built up to the crisis crossover and the last two episodes were more or less epilogues.

Ironically, the final season of the Flash will be 13 episodes long.

And the whole issue with treaty land. Overall, getting rid of them is more trouble than it's worth for the average person.