We do have the columns, although I do not believe anyone has written the support for them. Check the npc_types table to see what I'm talking about.
Also, for future reference (when these columns are supported):
Code:
#npcedit Texture
#npcedit Helmtexture
#npcedit Armtexture
#npcedit Bracertexture
#npcedit Handtexture
#npcedit Legtexture
#npcedit Feettexture