Apply collection-level tags

Is there currently a way to apply collection-level tags, or might this be coming in the future? I ask because the tags dashboard includes a "record type" drop-down. "Items" is the only option in my drop-down, but is it possible to apply tags to other record-types?

In general, other record types can also have tags. Exhibits, for example, allow adding tags, so if there were Exhibits with tags, that would change what's in the record type dropdown.

We haven't built that onto Collections though. A big impediment is that doing so would require updating all of the themes to know what to do with tags on collections, so I'm not sure that this will be coming anytime soon.