I've just released a new version of src2pkg (2.9), which fixes a couple of minor bugs when dealing with filenames which contain spaces.
The ChangeLog is here:
The installable package for Slackware is here:
A new option has been added: Setting the PKG_EXCLUDES variable lets you specify a comma-separated list of files, links or dirs to exclude from a package. The variable can be passed as an environmental variable, placed in a *.src2pkg build script, in the src2pkg.conf file or from the command line using the option: '--excludes=??,??' Thanks to Chris Lee <email@example.com> for requesting this feature, which now that I think about it, should have been there all along.