@d19dotca Currently, there is no way. The SA settings are set in stone. I can open up our mail addon git repo tomorrow so you can get a better idea of how we have implemented it.
But overall, our idea was that customers don't have to deal with implementation details like SA (for example, maybe we use rspamd later) and that spam detection should just work. If you have SA expertise, I am happy to incorporate your suggestions into the default settings.