I wish Katsulas would have still been alive because Tomalak in Nemesis would have made that movie so much better. I would have also wanted to see Sela in that movie. Hell, instead of what we got, I was always hoping Nemesis could have tied up the lose ends from "The Defector" and "Unification".
Andreas Katsulas died in 2006 and Nemesis was released in 2002, so Tomalak could have been in Nemesis. They just didn't use him.