There are several things that need to be done/thought for the 'video' section. and this is one of them. It would have been better to have a tab for 'involved people' for those of us who track such stuff. Entering something like
Editor: joe foobar; mary smith; Cinematography: someone else; Music: someone again
is really error prone.

AND is it Music: or Soundtrack: ? Being a database it would be nice to have defined consistency

Can this be added as a feature request?

Absolutely agree - It's difficult to maintain data integrity when the fields don't have auto complete. In Foobar auto complete fields are user defined. I'd like see this in MM

Under the Track Properties Details tab, the Involved People field appears to be a plain text data field that isn't parsed or indexed into the database linking individuals' names. You can enter your data values for individual names separated by a semi-colon here, as you can in other fields such as Artist or Composer. But the editor does not prompt you with a drop-down of already used names here the way it does for Artist or Composer. Can the Involved People field be parsed (and prompted) similarly? The same request would apply to the Original Artist field and any other similar field.