Send me a PM with the new name that you'd like to use and I'll take care of it. Others can do this too, if you wish. Unfortunately, I can't do anything about the avatar issue at present; this will likely be fixed when the new site software is introduced per Mike's previous comments.
I would also like to add that in general, I would discourage this as a casual practice, because it adds confusion to threads when "SnitzFan said such and such" and Snitzfan is now HenryPatheLehrmanFan. However, if you have a good enough reason-- as Ben's was for using his own name, given his prominence in the field-- we'll consider it.
We should respect the other fellow's religion, but only to the extent that we respect his theory that his wife is attractive and his children intelligent. —H.L. Mencken