how to stop submitter getting email upon any PR change?

[Mark Schlegel]

We have all our PRs entered by a secretary, she has 
no reason to get e-mails everytime a PR state
changes.  I read in a gnats how-to that there are two 
fields that the user can set in the 'config' file of boolean 
type called NOTIFY and ACKNOWLEDGE but from what I've read 
setting those to 0 will not stop these emails going to the 
submitter:
(One allows the time triggered email when the state 
doesn't get set to analysed in time, the other toggles the
one time mail to the originator at PR creation.)

In short, how can I set gnats/tkgnats not to
e-mail the originator/submitter upon each change to a
PR but only email the 'responsible'?

I suspect that the value of X-GNATS-Notify in the PR database
files are what's used to send the email, would that mean 
I'd have to edit all
the old PRs to remove the submitters email address even
if there's a configuration flag I can change in gnats
to stop new trs from having the X-GNATS-Notify being
set?

I've also noted that the secretaries entry in the
submitter file looks like:

klj:Karen Jones:klj@abc.edu

but the template in the comment says

submitter:full submitter name:type:response-time:contact:notify-others

so I'm also wondering if that should really be

klj:Karen Jones::-1:gnats-admin:

since I don't want response time used and I don't care about 'type'
(so leave blank) and to avoid the email (note last field is empty).
Would this do what I want?

ps. running tkgnats 3.0.13 and gnats 3.111

thanks,
Mark