It may not be much of help, but there was already a thread on this (
link to thread) in which I already suggested a solution to Auran (to make the "Missing Spline" selectable, but you can read the rest in the linked thread).
I also created a ticket at the Helpdesk on 23.Jan.2010 (If somebody from Auran reads this, its ID is "AJZ-808134") but it has been closed in the meantime without a solution.
So instead of having to hunt down all missing KUIDs all over the Internet to be able to change the missing track, I'm relying on Auran to eventually implement my fix suggestion at some time.
Perhaps this is a good chance to get some more people to join my cause so all will benefit.
At last it's an easy fix, doesn't require lots of changes and best of all I already successfully tested it for them.
Tata
Mr.Jingles