Actually no. In Windows when you scale resolution up, the fixed size objects made of bitmaps shrink down. This is what you refer to as 'zooming out'. Line Doublers do not increase resolution they just copy scanlines and multiply them across blank spaces in between. http://en.wikipedia.org/wiki/Line_doubler
Video Scalers with 3:2 pulldown, such as is included in many expensive modern progressive TVs and DVD player also do not increase resolution - they interpolate fields so that one progressive field is displayed instead 2 "half frame" fields for one frame of footage.
Maybe I've misunderstood you but your references don't seem to relate to scaling a 2D playfield to a larger screen area but maintaining the same effective resolution.
Also, for 2D games my theory of hacking the DirectX DLLs could apply for those games that use them in the same way. This is essentially what wrappers do - they emulate common functions or "calls" for one layer and reroute them to system specific functions for the target OS/layer.