start at boot, run as non-root

[n dhert]

I have FreeBSD8.2.
Sedna, an XML database server, had no port in th FreeBSD ports collection
but has a binary compiled for FreeBSD8 on www.sedna.org.
I installed that.
To start it at boot I created a script /usr/local/etc/rc.d/sedna :
-----------------------------------------------
#!/bin/sh
#
# PROVIDE: sedna
# REQUIRE: DAEMON
# KEYWORD: shutdown
#
. /etc/rc.subr

name="sedna"
rcvar=${name}_enable
command=/home/opt/sedna/bin/se_gov

load_rc_config $name

: ${sedna_enable="NO"}

run_rc_command "$1"
--------------------------------------------
and added sedna_enable="YES" at the end of my /etc/rc.conf

This way it starts at boot:
$ ps -jaxww | grep se_
root        7064     1  7064  7064    0 Is    ??    0:00.00
/home/opt/sedna/bin/se_gov -background-mode off -listen-address localhost
-port-number 5050 -ping-port-number 5151 -el-level 3 -alive-timeout 0
-stack-depth 4000
The deamon runs as root. I want it run by a non-root user, e.g. a user
'sedna''

How can I do that?

The sedna server binary se_gov has no option in its man-page to start the
program run as a different user ..