How to customize audio roles for ever ?

Sorry for bad english.

Hello,

How to customize audio roles list for ever ? In addition to dialogue, music, effect I want to add comment.
I know how to do this but I'm looking for a solution to have this personal role every time I create a new library. I use FCPX for daily news not for documentary or film. Is there a .plist I can modify ?
I don't see this option in the documentation, maybe no solution, maybe I'm wrong.

Thank's.

I don't know of a way to do that directly, but here is a simple solution:

Make a new library, and customize roles (and, if you want, keywords).
Use that as a template. Instead of creating a new library, just duplicate this template library and start working.

Thank's lichinho,

It's a very simple and effective solution. I will try.

I use Post Haste and it then creates all my template folders and a named FCP library

An other very good idea, thank's Rob Mills.