The filter-pill concept by @TW_Tones might also be helpful here. You can customize a tag-like interface where the drop-down collects tiddlers based on whatever filter-condition you like. It could be a single field-value, or something more complex (like tasks with this same place field-value, but only the ones not tagged done, or works by this same author, but only the ones published in the last 10 years, etc.).
You might want to combine this with a solution that offers a type-ahead drop-down to select from existing field values — a feature that I’d like to see widely available in all fields, whether or not they behave like tags.