it would be cool that JASRAC ID in work sidebar would get a css class name (for ease-up of data tier using) like dd.jasrac for instance.

If i understand correctly, the new JASRAC ID is an editable work attribute (MBS-5863).
I don't know if ISWC are now work attributes too.
If they are, i see that those have an own dd.iswc and a validation pattenr (their syntax is checked).
If all that is true, it would be cool that JASRAC ID would get a validation pattern (maybe it's already the case) like \d[A-Z\d]\d-\d

\d ← -i don't know if perfect and an own class name too (for ease-up of data tier using) like dd.jasrac.
If there is a work attribute editor for admins, allowing a validation pattern, a help bubble text editor and a class name editor would be nice i guess.