A: (gnats 3.1xx) The fields and their names are fixed in gnats 3.1xx, so this is not possible.
A: (gnats 4.x) Edit the file dbconfig to reflect your changes.
Note that the PR fields with the builtin-names severity,
priority and state are required if you want automatic
reminders (notify-about-expired-prs = true). In this case, the
file submitters must also contain a response time.
The severity field is checked for values critical and
serious, and priority for value high.
This is currently not configurable.