I tried Raging Thunder and RoboDefense with LCD Density set to 190 tonight. Both showed windowed as in your screenshots above. From what I've read, Android introduced new scaling functionality in builds after 1.6 that need to be coded to by developers. If the app doesn't scale correctly is has to do with the way its coded, so it won't be easy to fix via a hack.
You can get the app to at least be full screen if you disable Compatibility Mode in Spare Parts and then reboot. It may look ugly with some apps but it at least uses all the real estate of the screen.
The next thing you do after this is let the app developer know about the scaling problem and have them add resolution independence to their app.