DirectDrawRenderer=opengl - screen size changeable for final rendering?

[Christoph Frick]

hiho

what i ever wondered but never dared to ask:

i tried recently the said key with jagged alliance 2. as the game has
quite a low resolution 640 or 800 it would be nice to allow higher
resolutions when rendering ddraw with opengl (e.g. game wants 800 but
for the final rendering use 1600). is this doable via registry or
somewhere else? for the files: i run the apps in desktop-mode.