Workflow with ActionScript 2.0 and the Flash IDE [CS3/4]

I’m required to use ActionScript 2.0 at work, and I’ve been trying to come up with a “best practices” document.

I’m already trying to write the majority of the ActionScript in external files and linking them to symbols in the library, but I’m having a hard time determining what the best way to run the main logic is. With AS3, I can set the document class, but there’s nothing like this for AS2. Is it best to make a MovieClip that drives the screen, or is there a better way to do something like this?