In previous Sims games it was possible to make clones, zombies from dead sims and perform plastic surgeries (TS2)...and all the fun stuff.
I am really surprised that there's none of it in TS4.
It's ok that DNA sample discovers traits and aliens, but c'mon, its a D N A SAMPLE, it has to have more to it.
I love the idea of being able to determine parents (and their traits), clone sims, use some of the attributes to alter details on existing sims (like add a trait or eye colour), and do all sorts of things you can't the other ways.
I wonder if this is even the right place to write suggestions like this...