When playing in a window, DOSBox will resize according to the game you're playing. You can control the window size with the windowsize parameter but I don't want all games - regardless of their original resolution - to play at, say, 1280x800 - I want all games to play at, simply, twice their ordinary size.

ie. I don't want to play 320x240 games at 1280x800 - I want to play 320x240 games at 640x480.

Any ideas as to whether or not this is actually possible?