Bukkit

When crouching, the player's temperature should go up a little bit to simulate that they are "huddling for warmth." Pretty straightforward.

Also, when in bed, the player's temperature should go up, but not to the point where they get exhausted (from high temperatures) in bed. The point of this is to make it so that one can sleep in a cold biome at night (and while it's snowing) even in the simplest of homes (e.g. a small dirt house).

However, some people may not like either of these features, so it would be nice to be able to turn either one of them on or off. The temperature increase should also be configurable.