I'm back to working on this now.
I'm trying to figure out who to list in the History or Credits section. Is the following accurate? If not, please make corrections or additions.
sixpack69 - original author of UBB.threads version 5 hack (5/01)
Dr_Manhattan - reworked hack (11/01)
Max Fisch - reworked hack (2/02)
Lisa_P - adapted hack for version UBB.threads version 6 (5/02)
Astaran - added fix so that hack would work correctly when old and new usernames differ only in alphabetic case. (6/02)
References:
Plug-in: change username Change Username Hack, reposted Change Username Hack