[support] drush archive-dump selected directories

FYI: I am new to drupal, drush and PHP but am an experienced programmer in other areas. Am familiar and comfortable with the command line.

I use drush on both Linux and Mac.

I have a drupal site to archive, but there are many directories under the filesystem root which are not part of the site.

NOTE: This has happened because I use Hostmonster and add-on domains are "added on" under the site root.

I know that archive-dump has an exclude option and I could chain a couple of dozen 'excludes' but that's not nearly as 'elegant' as chaining seven 'includes' - which would be

includes, misc, modules, profiles, scripts, sites, themes

Any ideas?

thanks