Automatically filtering multiple categories of messages is a feature I’m considering for a future version, but right now SpamSieve is only designed to separate spam messages from good ones. The good news is that recognizing spam is much harder than sorting other types of messages. So it should be straightforward to create some rules in your mail program to recognize mailing list messages (e.g. using the List-ID header) and move them to another mailbox. You could probably do this for the conference calls, too.
In Apple’s Mail.app, the user can configure rules to sort emails into specific mailboxes. Go to: Mail > Preferences > Rules
I’ve used this feature for years to sort (among others) mailing list emails.