Now having said my peace, I do agree that if Lucas had written all three movies before he started on TPM, the PT would have been vastly improved… maybe even great.
Many years before this novel, I had written two scenes for Dooku for Episode I. He runs into Jinn and Kenobi in the Jedi Temple. It would have established his existence, some of his history, and a few of his beliefs. He even sees Anakin and inquires as to who he is.
I felt this would add to his larger role come Episode II. The same for Grievous. I had an idea to show Grievous in Episode II as his alien self before the accident. And guess what? He worked for the Republic. He was the head of the Galactic Republic’s Security and Defense forces. There isn't much to it, and with the Separatist movement swelling, he wants a clone or robot army for the Republic along with a huge increase in military spending. I made it so that he was a General on his home world which was rife with war, first amongst themselves, then with neighboring planets before they became part of the Galactic Republic.
When he gets frustrated with the whole affair, he jumps to the Confederacy. He has no loyalty. In his eyes, The Separatists will do things the right way. We see his ship get shot down during the Battle of Geonosis and that’s why he ends up like he does. See, he was at the secret meeting with Dooku, selling out the Republic. Obi-Wan sees him there along with the others and reports back to Coruscant.
Oh, and no lightsaber use either. That was crap. I make him this great shot, an unbelievable marksman. He'll kill Jedi, but he picks them off from distance. In close, with his four arms going all at once, he still manages to kill some lesser Jedi, but he won't get too close to a true Master for obvious reasons.