He removed sigs because most of them were a pain to look at. We had a file size limit and a pixel dimension limit set, but why waste bandwith on stuff that looks like crap. Sure, some people had very nice sigs, but it was not enough to outweigh the crappy MS paint ones.
There was a lot of argument over this when it first happened, do not expect anything to be changed. They might be able to do something since they moved to a new server, but I don't know the specifics, and I still doubt they'll decide to allow them.