The authority toolkit can create a 400 for the former 100:
The first of these creates a suppressed 400 for the former 100 in every case; the second of these allows a degree of operator control over the 400 field.
Control over creation of the 400 for the former 100 is also available when one changes the 100 field by editing it directly:
Gary L. Strawn
Northwestern University Libraries, 1970 Campus Drive, Evanston IL 60208-2300
e-mail: [log in to unmask]
voice: 847/467-7240 (office) 847/467-4619 (storage facility)<--NEW!
authority toolkit documentation: http://bit.ly/1Hl1jST
Forsan et haec olim meminisse iuvabit.
And it seems that the FAQ does not apply to Fidel Castro, because it talks about references from the AACR2 form, and Castro’s record was already RDA when the death date was added. Was this person at LC saying that a reference should be added WHENEVER death dates are added? I hope not!! I certainly haven’t been doing it.