Sync Gateway: Multiple buckets through one db?

I’ve stared to build a service with CouchDB. The app is designed for users to have unlimited buckets for several reasons.
Now i’ve changed to Couchbase. I’m using PouchDB that’s why i need Sync. Sadly I can only map one bucket/database.

This would be a perfect solution for me: /db/bucket/etc

Any ideas how to achieve this?