Editing Tags & Metadata in Bulk

Currently, it is only possible to add tags to individual assets. It is not possible to add a tag to a batch, series or selection of photos. I can imagine many would like there to be a feature like this.

We work with a large amount of photographers on an annual basis and adding tags and metadata often goes wrong.

Similarly with adding copyright information to assets. It currently takes it's information from LR or C1, but we'd really like to ability to add copyright information in the system over a batch of assets, preferably copyright and photographer name separated (like in Lightroom).

Is this a feature that can be added?

I'm a huge fan so far of Picflow but this is one I'm really missing!

Thanks!