Address book limitation

I’ve just installed - and promptly uninstalled - AntiSpam, because I can’t import my massive email address book.

My email program is The Bat, which exports address books in a variety of vanilla-flavour formats - none of which can be imported into AntiSpam.

As an average Joe User without any knowledge of programming, I’m a bit surprised that a CSV import facility isn’t provided in AntiSpam. Is there any technical reason for its omission?