I was looking at something like that for my own personal install. Rather, higher quality explosions. But, to my dismay, the nanofx script calls for a single texture and cycles through the sections in the texture for the explosion. 1 texture for each different explosion. Although the damage texture, is scripted to look in a folder and use all the textures (in order). Like the explosion ring, that's 1 texture.
Hope you figure something out.