Ciao,
I wrote a simple free guide to DVD scripting with DVD Architect Pro 4.5 (but also with DVDA 4).
. Chapter 1
. Chapter 2
. Chapter 3
. Chapter 4
. Chapter 5
I know that it's only in italian, but you can download my DVDAP4.5 projects and see the code of the example scripts that I made for this guide and...maybe...if you know italian you can also read it! :D :D
Some script are translated to DVDA and modified by the same for DVD Studio Pro.
Ciao