Bulk changes would be good to have as I'm just starting out using the app. After manually migrating 15 or so entries from another app, I realized I needed to add a tag to all of those to be able to filter just for those entries. That was still manangable to do with 15, but once I have hundreds of entries and would like to do such a tag change or similar, it would be a lot of work.
Bulk tagging would be nice not only on tags, but also map locations.
And I'm still in the process of discovering the potential of the app.