In the KotOR1 tutorial, the use of liv_m99a* is more of a shortcut than a necessity. Bioware had left aspects in their planetary.2da and Ebon Hawk scripts that made use of that naming convention in the event that new content would be available by download.
TSL does not have any built-in shortcuts like this. However, stoffe has laid out all the steps required for building a custom planet (
http://www.lucasforums.com/showthread.php?p=2162797#post2162797) and the explanations behind each the necessary script modifications. You will find that you can essentially name your module anything you like (16 chars or less) if you follow her tutorial.