I find the fact that only one image per sig is pretty annoying. Smileys are considered images too so I can't add a little smiley into my sig other than my DGM fan club button. I was thinking that you can at least increase the amount of images to 2 or 3 at least. Not unlimited though because if some idiot fills his/her sig with only smileys, it can be troublesome.
Just a thought.