as discussed on IRC on 2.12.2020 on editing bibliograpic data cgi-bin/koha/cataloguing/addbiblio.pl quite often "functional defaults" are needed, like dates, sequence numbers and so on mostly those values should be transparent for the users ie those values must not be edited or even not seen by the users the only possibility at the moment (at least I am aware of) are the value_builder plugins /usr/share/koha/intranet/cgi-bin/cataloguing/value_builder which need a least some user intervention, like clicking the fields good examples are controlnumber 001 and 005 (maybe 003) which mostly would need no user intervention at all see bug https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=9921
It looks like we have after_biblio_action as a hook that should work here. Please reopen if I misunderstood!