Automatic document linking or email routing

We have the need to take in email (from one or many accounts, it doesn’t matter) and create/update Issues and Opportunities. We already have an email account configured with automatic linking to create Issues.

I went to add one for Opportunities and was reminded that only one email account is supported for automatic linking. Is there a way to do this for two or more document types? Perhaps there’s some internal filtering feature that I’m not aware of with similar behavior? The use case seems reasonably common.