I’d love to have a way to publish content to multiple categories and/or groups.

Here’s an example. We might have a great external event that we want to highlight both for our community and for a particular regional group in a topic. While we can publish that content somewhere in the community for all to see and can make that event featured content in a group it’s not ideal. It often means one or the other loses out. 

A group member may post something that could be of interest to the wider community and the group OR a community member may post something that’s potentially also relevant to particular groups.