I gave this a try, and it does seem to change resolution...however, it seems to 'double' the lines regardless of whether the line mode setting is on 'normal' or 'double'. Basically horizontally it looks fine, but vertically the image is stretched and too tall to fit on the screen. I tried quite a few different modes, but particularly 368x240.
I have some pictures of 3d Pool in this mode with the line mode set to 'normal' and 'double'. The stretched ball and jagged lines look to me like the lines are doubled.