Weird. I posted a reply yesterday and it's not here.
In your Amiga emulator can you set up (for example) a 2048x1536 or 2560x1920 draggable (emulated) screen?
>I grepped for "resolution" in the source code files and wound up in sdlgfx.c
Is which software? The nVidea drivers? The Xfree software? The emulator?
Good work BTW... be sure to contribute your enhancement back to... whomever it is.