How to build distfiles from _source directory

I guess I'm missing something very obvious, but I could not find the script/program that strips comments and whitespace from the JavaScript files in the _source directory to create the combined js-files for the distribution. How can I do this for myself?

We need to extend FCKEditor so that one can easily add ToolbarItems that call custom JavaScript-Functions. I think I have found out where to add the extension in the files located in the _source directory. Now it really would be nice to be able to apply those changes to the "compressed" JS-Files to actually use them. Any help about how this can be done, or where to find documentation on that would be highly appreciated.

Of course we are willing to contribute the extensions we develop back to the project. Is the "Patches"-Section on sourceforge the preferred way to post patches? Should we use version 2.0b2 to create the patches, or is there any recent developer's version available? There does not seem to be a cvs tree visible on sourceforge...