i'm just going to list my idea as i thought of it tell me if you can think of anything to add and tell me if its a good idea my idea is that when you are in a snow biome/snow you slowly freeze untill you cant move but you can unfreeze by being near a fire. if you stay frozen to long then you take damage untill you die other people can push you so that they can get you near a fire
Oh god timers... but I like the idea. And it is impossible to make someone unable to move and others can push the player. EDIT: You can use my Freezer plugin but you need to type /freeze [Player] to freeze someone.
then forget the pushing idea. i was more thinking along the lines of being frozen slowly in cold rather then saying /freeze [Player] so more of a rpg thing
what about Block.getBiome() and BukkitScheduler.scheduleSyncRepeatingTask(Plugin plugin, Runnable task, long delay, long period)? The APIdocs are really helpful...