Subpixel rendering would give the font 3x the horizontal resolution. Its just as useful for bitmap fonts as it is for vector fonts. Especially at that resolution, anything that makes the font more legible would be a boon.
Some years back I built a family of fonts around the idea of anti-aliased raster fonts realized as regular truetype outlines - http://pippin.gimp.org/0xA000/ - in which some variants of the family is designed to be crisp on many integer multiples of the base design size.