Best practice for setting styles in module based site?

I am interested in discussion/advice regarding the best Actionscript practice for setting styles via text formats and color variables for a module based site.

Currently I have text formats and color variables set up in my Main swf file. I would like to be able to use those same styles in numerous modules that will be loaded into the Main swf file.

Image shows swf relationship:

A) Is it possible to target the style variables in “main.swf” from “module2.swf”? I haven’t been successful in my attempts so far.

B) I could use an external Actionscript file, I think. But that would be an additional call to the server to load each module. Is that worth worrying about?

Thanks for your thoughts.

-pm