Flex Dependencies File Size

Hello, I am loving being able to add SWC Dependencies in Flash, however in a flex module I am only using one class from another module SWC and it includes all the classes from that dependency SWC, resulting in a large swf file.

Why doesnt the compiler just include the classes from the SWC file that are required? I am asking as I have read about this being possible, from adobe http://livedocs.adobe.com/flex/3/html/help.html?content=compilers_14.html ;

library-path path-element [...]
Links SWC files to the resulting application SWF file. The compiler  only links in those classes for the SWC file that are required. You can  specify a directory or individual SWC files.

I assume IDEA supplies the compiler with something similar to this?

Cheers.