Default window placement/positioning

Since the smart-window placement/positioning was introduced, any windows where the placement isn't set by the application are put in a large enough empty space. If there is no space large enough for the window, windows are positioned in the top-left corner and stacked diagonally so title bars are visisble on multiple windows.

I have a large screen, and would like the option for windows satisfying these conditions to be placed in the centre of the screen as I find myself continually dragging the windows back to the centre.

Example:
Open firefox (or a similar application which takes up most of the screen) - It is opened in the location stored by firefox.
Open another firefox window - It is opened in the top-left of the screen forcing the user to drag it back to their preferred position where the first window opened.