Global effects. Cactus stops rain. Redstone dust starts it (hint to the lightning powers of redstone block). Watch (clock) pushes time forward, and responds to glowstone boosts by jumping time forward more aggressively. All have timeouts enabled to avoid stressing the server too hard.
Modifications to RegenerationSnowball. If I spammed multiplied multiplier regen snowballs, the server tended to lock up leaving snowballs bouncing in midair sporadically. Trying to find ways to mediate this and still permit total spammage on the part of a mod (creative). Currently with this, you can single-multiply regen and it's not too fragile, and you can spam single regen snowballs quite freely without issue.
Players won't be doing this as they have other obstacles, but I would like to restrict the regen to 'no modifiers' or at least 'no multipliers' as it seems awful good at locking up the server.