This is not a question, but an answer.
(sorry for being off-topic ;-)
But a while back somebody mentioned/complained/asked about how MusicBee handles it when you have set a symbol under 'prompt' in track details, and the tag is a multi-value tag that is set to split into rows.
In that case only the first entry will have the symbol in front of it and the other entries won't.
Which I agree is not optimal and can look weird.
Re-configuring my own setup I remembered the question, so here is an answer.
(let's hope the member that asked about this reads this)
Under 'prompt' enter the symbol that you desire.
Then under 'fields:' set your tag, but surround it using the $Replace function to replace the semi-colon with a semi-colon and the symbol of your choosing.
That would look something like this:

And would result in something like this:
