Making your own high rez patch will involve cojuling the game code into stretching the backgroudn by non-whole intigers (like 1.33, 2.2, etc) which the rendering engine won't respond to very welll... and, you could re-write the rendering engine so that this wouldn't be a problem, but you wouldn't have room for it (apparently, there's a hardset limitation for how much code the game can have.. for every line of code you make, you have to get rid of another one. I don't understand the problem 100% myself, but that seems to be the crux of the Saint's inability to make other resolutions).
So basically, you'd have to write a whole new engine. Which is what the Q-Gears project is all about. Maybe you can lend them a hand =)