Q: When entering a new PR, I want to assign a value to some field
(e.g., Responsible) which is normally assigned by gnats.
A: (gnats 3.1xx) This is not possible in gnats 3.1xx.
A: (gnats 4.x) This is done by adding the field name (in this
example, Responsible) to the initial-entry item at
the very end of the dbconfig file. Gnatsweb will pick this up
and add a Responsible field to the Create PR form.