Hoewel ik niet snap waarom je dit wil, heb ik even voor je gegoogled. Tot nu toe met weinig succes.
Ik vraag me toch af, wat nu precies je argument is nadat je dit stuk uit de
Apple Human Interface Guidelines gelezen hebt

Your application determines the minimum and maximum window size. Base these sizes on the resolution of the display and on the constraints of your interface. For document windows, try to show as much of the content as possible, or a reasonable unit, such as a page.
Your application also sets the values for the initial size and position of a window, called the standard state. Don’t assume that the standard state should be as large as possible; some monitors are much larger than the useful size for a window. Choose a standard state that is best suited for working on the type of document your application creates and that shows as much of the document’s contents as possible.
The user can’t change the standard size and location of a window, but your application can change the standard state when appropriate. For example, a word processor might define the standard size and location as wide enough to display a document whose width is specified in the Page Setup dialog.
The user changes a window’s size by dragging the size control (in the lower-right corner). As a user drags, the amount of visible content in the window changes. The upper-left corner of the window remains in the same place. The actual window contents are displayed at all times.
If the user changes a window’s size or location by at least 7 pixels, the new size and location is the user state. The user can toggle between the standard state and the user state by clicking the zoom button. When the user clicks the zoom button of a window in the user state, your application should first determine the appropriate size of the standard state. Move the window as little as possible to make it the standard size, and keep the entire window on the screen. The zoom button should not cause the window to fill the entire screen unless that was the last state the user set.
When a user with more than one monitor zooms a window, the standard state should be on the monitor containing the largest portion of the window, not necessarily the monitor with the menu bar. This means that if the user moves a window between monitors, the window’s position in the standard state could be on different monitors at different times. The standard state for any window must always be fully contained on a single monitor.
Als je het rommelig vindt, waarom gebruik je dan niet de "hide others" functie? (cmd+option+h) om er alsnog voor te zorgen dat je zoomed window als enige zichtbaar is? Ik snap niet waarom je je windows groter wil maken dan nodig (zeker niet op hoge resoluties. Websites zien er vaak verschrikkelijk uit op 1680x1050

).
Omdat dit toch niet het antwoord is waar je op zit te wachten: Ik denk dat je het meeste kans maakt in de AppleSript hoek

[google=applescript resize window] en [google=applescript window geometry] kan je hier wellicht verder mee helpen, als je echt niet Apple's manier van Human Interfacing kunt waarderen