Joe, thanks for the quick response! So if I want to do this (write in non-alphabetical order), the disk is non-standard. Fortunately, the non-standard disks I have created so far do work in my car player. Unfortunately, the program that I used, and that the CDRFAQ suggests as a solution, is orphaned so I can't use it anymore.
If anyone else knows of a method to create non-standard disks, I would appreciate hearing about it.