sure! after you set your aspect ratio, tick the Constrain box. THEN go to edit (at top toolbar), general preferences, tick launch to preferred state, then click the set to preferred state button in that window. Now when you open your POSER the winder will be set at the size you last selected. HOWEVER. I have noticed that even when ticking the constrain aspect ratio thingy, when you resize the document window it has a 1-3 variance of being exact accurate. Nothing that has ever been enough to notice in the render, but ..... I hope I didnt misunderstand your Q.........