About the window placement, we still have a problem with that, indeed it is hard to place a window precisely. The main problem for me is that I find it a very important feature that the windows are based on sketches, because it makes them extremely powerful, you can basically turn any shape your imagination can produce into a window. The problem is of course that we cannot use the sketcher tools to lock the position of the window on the wall, because that would create a dependency loop between the window and the wall. I was waiting to see what external constraints the assembly module could offer, actually...
But your ideas seem good, it might already help a lot. And indeed I guess not many people use the "start from scratch" entry, so it could be removed from that list, and be turned into a button.
Restricting the preset windows to the active workplane might indeed be handy, and I liked the idea of being able to add windows in plan view
