It is technically possible to embed multiple legacy nVidia drivers into the LE image, but this bloats the LE image and is something we have always made a strenuous effort to avoid. From memory ~75% of the cards supported by 304.xx are below GeForce 8xxx which (launched in summer 2007) was the first generation to support VDPAU hardware acceleration, and ~10% of the cards above that threshold still work with the 340.xx driver.
NB: The raid card driver change has been reverted, because if it's only used by one user and that user needs to self-build an image to get old nVidia support, it's another one-line change for the user and we don't need it in the core image.