Past that, I’d use a script, similar to what Peter mentioned. I tend to just write simple perl regex’s to work right on the user.conf files.
eg: disable spam:
cd /usr/local/directadmin/data/users perl -pi -e 's/spam=ON/spam=OFF/' *.user.conf
for example (of course, that’s just a setting and hasn’t actually “done” anything.. to really disable spam, you must delete the users user_prefs file. If you want to delete everyone’s user_prefs file, type:
rm -f /home/*/.spamassassin/user_prefs
Each option in the user.conf may require some sort of action, which is why doing it through DA itself is usually better.. since DA does the action for you, as well as setting the user.conf file.