Include taxonomies

At the moment it is possible to exclude taxonomies, but on a news website or something similar, where people can subscribe to different kinds of topics, it would be nice if we could include taxonomies for posting. If there are many taxonomies it is more practical to include a taxonomy to post than to exclude many.

An even better example is a recipe website where ingredients could be taxonomies, or you want to update subscribers when there are new recipes but not when there are new products or a new videos. Including the taxonomy recipe would be much easier than excluding lots of unwanted taxonomies.