I took a small break from wow, but now that the release date of wotlk has been anounced, i am back

As for the chrono beacons: i had the chrono beacon on a hotkey in each window and after the boss was on the stone elementals i simply activated it manually in each window. The guardians summoned are quite fragile so the key is to do it fast in order to get a few slow-time-buffs on the boss.