May I suggest an added functionality to the scale behaviour in dynamic components: That you get to set the size of your scale box as well, controlled like geometry, with LenX and so on. That way one can have ones window trim outside the scale box. You can scale the window to match you cut hole, and safely assume that when you turn your trim tags on that trim will stay outside your cut hole.
I know you can fredoscale your window and set scale distance.and thus coping with a scale box that is larger than your visual object. But This feels like something sketchup should do out of the box.