MegaGlests' game mods menu let's you install many new mods. Even more are available on the MegaGlest Wiki and the Mods forum.
I like having the black in there because it looks kinda sinister and evil, since he's an Inquisitor... so yeah. I don't think a WC3-style hero glow is possible.
I have no clue what WC3 hero glow would be like, though the Megapack's genie has a good example of looking more like a glow than smoke.