Add a command to refill hunger

[Amunak]

/uh heal(all) could use a companion: /uh feed(all) [hunger=20] [saturation=20].

Note that

The maximum value of the food saturation level is equal to the current value of your food level.

[AmauryCarrade]

You can also use /effect [player] SATURATION 100 255 to refill the hunger bar of a player.
(Note that for the saturation, the time is divided by a big number: a ~100-seconds effect leads to a ~3-seconds one (not real numbers, but the idea is here).)

This said, there isn't any @a in Bukkit out of a command block (I don't know why, by the way), so I agree: this, especially feedall, can be useful.