set unity 4.3 2d origin position to topleft?

Hi, Is it posible to set the origin position to topleft in unity2d? I just want to know if i can pass my knowledge from using an open source 2d game library to this engine. Most 2d have top left or bottom left origin position in the screen while in untiy the origin position is on the center.

The reason i want this ways is that i am trying to create a pong game and check if the paddle reach the x axis to the width of the screen. that way i can easily have a collision and limit my paddle on the screen.

Like this

if(object.transform.position.x > Screen.width){
//collision happend
}

Might be time to pull some maths out of your toolbox:

if(object.transform.position.x > Screen.width/2){
//collision happend
}