TextMate has a nice behavior when the caret is between curly braces and you press return

{|}

turns into

{

  |

}

I'd like to have the same behavior for round and square brackets. And I achieved that by replacing in the grammar the meta.brace.round.js and meta.brace.square.js scopes with pairs of punctuation.section.scope.begin.js and punctuation.section.scope.end.js, but this looks like a hack to me, so I was wondering if there's a correct way to achieve that.