How about this idea for a Sokka backstory?

Years ago, out in the open waters just north of the Southern Water Tribe a large Earth Nation boat holds position. Tied next to it is a small Water Tribe canoe. Inside there are two men talking, and a small boy laying on an operating table.

"Are you sure you want this operation done? It is only used on worst kinds of people."

"I know, but it's the only way. After my wife died, he's been filled with such rage. I've seen too many men die with that kind of rage in their eyes."

"Alright. But even if all goes well, it was never meant to be used on a child. He may be able to adapt to the restrictions on his body, but he may never reach full potential. And I can't even think about what may happen to him should the beads be removed."

"What about his mind? What effects might this have on him?"

"The beads only alter the workings of the body, the state and development of his mind will be preserved."

The doctor preforms the operation. It was specifically designed to block the chi flow in benders, and was used in the extreme cases were a bender could no longer be trusted or contained by conventional means. A set of small glass beads are inserted along the boy's muscle pathways that correspond with certain movements.

Later, the beads can be removed allowing Sokka to reach greater fighting abilities. Making him an equal fighter to the other members of the group, who are continually learning new bending abilities.

Don't mind. Every one has an opinion. That's what this place is for.??