Batch edit on Multiple Choice fields to allow "add only" and "remove only" option

Batch updates on multiple choice records are currently executed as field overwrites. I would like to add an option that would allow batch updates to add or remove an individual multiple choice option, leaving the remaining untouched. This is most often needed for fields that behave similarly to tags.

In that example, I may want to add a new tag to a dozen records, without overwriting the tags currently on those records.