#1, or whatever helps to keep the competition healthy (and Zak is most likely the best guy to listen in this respect). The rulings can be fine-tuned later on, as to avoid never-ending races or excess parallel tracks. As Krys mentioned, a good time to switch would be when ideas for special rules run out (forecast for about... October?). And finally, if you pardon the unelegant (as of now) outsider intromission , I do not see you drivers giving up ZSC... as for this newbie, I hadn't even the chance to join!!
