1280x960 is the correct ratio for a screen resolution.
Your screen should be in 4:3 ratio, 800/600, 1024/768, 1280/960, 1600/1200 etc. Most people just ignore that and use 1280x1024 anyway (Not that it really matters )
I'm sure that some games will get the resolutions from Windows settings (so you can't scrw up and go too high) so if you could somehow get the custom res' into the windows display properties then you may be able to get them in (some) games.
I am a big Powerstrip fan and have used it for quite awhile. For gaming it works great especially if your having gamma problems from one game to the next. Often too dark to see what the hell is going on in the game. Its also allows you to set your display options and works great with most all video cards. Anyone who has a PC that is over two years old and has an older video card trying to run the newer games, this program is a must. Its definately one of best free program utilities out there!