If you don't like the school tax rate, start complaining to those running for State Rep or State Senate. They ultimately control the purse strings.
I would expect that if we are at the legal limit and still unable to sustain our standards, that the goal would be to fix the root problem and not change the tax rate limit.
Fixing the root problem
was addressed by jrob....contact your state-level representatives. The root problem is in Austin. Leadership in Allen is doing the best they can with what they've got. To truly turn things around, our representatives (and governor) need to listen to the people.
But for here at home, we need to fill our school board with educated people that understand school finance so that they can help take on Austin, and keep our school district running smoothly until Austin sees reason.