I'm also trying to open default lister in center of the screen. I have found options for launching the default lister "in a fixed position relative to the monitor the mouse is on", "always in the same position" and "always over the mouse pointer". A useful option when switching between my laptop and large external monitor would be "always in center of screen".
If it helps, a script add-in could move windows when they open, via the OnOpenLister event, SysInfo object (to get the monitor coordinates) and Set LISTERPOS command (to move the window).