stopsignal
The signal used to kill the program when a stop is requested.
This can be any of TERM, HUP, INT, QUIT, KILL, USR1, or USR2.
Default: TERM
Required: No.
Introduced: 3.0
stopsignal=HUP
é o que você está procurando:
[program:uwsgi]
user = uwsgi
command=/usr/sbin/uwsgi ...
autostart=true
autorestart=true
stderr_logfile = /var/log/uwsgi/err.log
stdout_logfile = /var/log/uwsgi/out.log
stopsignal=HUP