Hi,
As far as I know, most of the standard metadata defined through the standard metadata tags (Event, Style, Inspectable etc.) is mainly used by Flash Builder for auto-completion and in the design view. Is this data included in the compiled swf? If yes, would it make sense to define them outside of the source code, e.g. in an XML file parsed by Flash Builder and other IDEs, to make the size of compiled swfs smaller? I'm not talking about metadata used at runtime, like Parsley and Swiz metadata.