is there anything else I should add?

You really alrady made an awesome addition to 3DGS with these glow shaders.
Just send us a download link one of these days when you'll have time i'll test it and perhaps other people also ?

Perhaps you could make some glowing shader that would need no alpah or Glow special maps ? (It would take the luminosity of the color by default)
This idea is lot more for some games based on 2D Sprites (or quad polygons with textures).