This is not really a tweak but it does make using Nero under XP quite different and in some cases, better. If you use Nero 126.96.36.199 give this a try. It is better to use in some ways.
Here's a bit of interesting info: Nero is apparently also Nero Express or the vice versa. If you have the newest version of Nero (188.8.131.52) all you have to do is change the target path on the shortcut from: "C:\Program Files\ahead\Nero\ Nero.exe" to "C:\Program Files\ahead\Nero\Nero.exe" /w and bingo instant enhanced GUI of Nero Express.