FlexFormatter AutoFormat

The FlxFormatter allows you to cause a Format or Indent operation to occur when an editor is saved. Operation for ActionScript and MXML files can be controlled separately. Check the appropriate box and decide whether you want Format or Indent to occur. Operations of either kind can be performed manually as needed.

Excluding files from AutoFormat

It is awkward if there are certain files that you need to edit, but don't want auto-formatted. The solution is to specify an exclude list of paths that should not be auto formatted even if they would otherwise be. You can add one or more regular expressions that match files that fall into this category.
The rules are:

Examples

all paths containing a package segment of "adobe"

.*/adobe/.*

Actionscript files that come from a third party with "org" package (notice the escaped period before the file extension)

.*/src/org/.*\.as