Window (target) model request

Is it possible for you to allow us to create a window model that doesn't have a pixel count on the bottom? I want to use the window model, but for my front door. I won't have any pixels on the bottom, but the modeler will not accept "0". Can the window model be configured to accept all the pixels on just two sides? Say the left side and the bottom or the right side and top? I guess I only want to use two sides of a square. :) Thanks Sean for any help!
Donny