Some things ive said before about P revisions that have gotten some support:
Pre-defined revisions, Start with 15-week revs, with a vote to extend to 20. It keeps things fresh, and the eternal "new-rev when" question will be answered. With revs lasting approx 3 1/2 months, its not too short to be cut, but not too long to fizzle. Here's where I first brought it up
Also a 5x5 nether portal arrangement would work best, a good round number, easily dividable into military alliances when the late-rev wars begin, and has midway points so you dont have to travel too far.