Combination with custom and other publish() packages?

[testbird]

For example, an important meteor pattern is to "publish with relations", as there are no table joins. A package for this is https://github.com/erundook/meteor-publish-with-relations (see its publish API)

But publications may publish data from arbritrary sources (e.g. HTTP requests and others), not just collections.

It would be great these could be combined. For example, if filter-collections' sort, filter and pagination features could be added to custom publish functions, or, custom or publish-with-relations functions could be added to an (explicit) filter-collections publication definition.