gistfile1.sh

## Sample screenrc for rtorrent
## put it in /etc/screen.d/
## and chown for the user you
## who wish to run session

source /etc/screenrc

chdir /home/stuff/dump/

screen -t rtorrent -d . -s .

screen.sh

#!/sbin/runscript
# Ilya Dmitrichenko < errordeveloper - at -at- g m a i l -dot- com
# Distributed under the terms of the GNU General Public License v2

# Originally written for Gentoo, but should work on other platforms :)
# http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=2&chap=4

depend() {
	use net debug
}

start() {

	## SVCNAME is the name of this file in /etc/init.d/
	## so one can creat /etc/extra-screens.d/ and put
	## the screenrc files there, then simlink the files
	## /etc/init.d/screen -> /etc/init.d/extra-screens
	for SCREENRC in /etc/${SVCNAME}.d/* ; do

		SESSION="$(basename $SCREENRC)"

		## I don't think there may be a security issue,
		## provided that users will not be have write
		## permission in /etc/screen.d/ and if anyone
		## gained access to mod the session file, they
		## are in already anyhow!
		BELONGS="$(stat $SCREENRC --printf=%U)"

		MYSHELL="$(getent passwd $BELONGS | cut -d: -f7)"


		COMMAND="/usr/bin/screen -- -U -D -m -c ${SCREENRC} -S ${SESSION} -t ${SESSION}"

		## Why on earth would one write this ???
		#HOMEDIR="$(getent passwd $BELONGS | cut -d: -f6)"

		ebegin "Starting ${SVCNAME} session ${SESSION} for ${BELONGS}"

		PIDFILE="/var/run/${SVCNAME}.${BELONGS}.${SESSION}.pid"

		start-stop-daemon \
			--env TERM="rxvt" \
			--env HOME="~${BELONGS}" \
			--env SHELL="${MYSHELL}" \
			--env SCREEN_SESSION=${SESSION} \
			--user $BELONGS \
			--chdir "~${BELONGS}" \
			--make-pidfile \
			--background \
			--pidfile=${PIDFILE} \
			--exec ${COMMAND}
		eend $?
	done

	#screen -li || /bin/true
}

stop() {

	## Perhaps we should determin this by pidfiles ...
	## but this way is not bad either!
	for SCREENRC in /etc/${SVCNAME}.d/* ; do

		SESSION="$(basename $SCREENRC)"
		BELONGS="$(stat $SCREENRC --printf=%U)"

		PIDFILE="/var/run/${SVCNAME}.${BELONGS}.${SESSION}.pid"
		PROCESS="$(cat ${PIDFILE})"

		if [ -e /proc/${PROCESS}/status ]; then

		grep -i "Name:" /proc/${PROCESS}/status | grep -iq "screen" || continue

		ebegin "Stopping ${SVCNAME} session ${SESSION} for ${BELONGS} (PID: ${PROCESS})"

		## It will CERTAINly kill the righ screen!
		CERTAIN="${PROCESS}.${SESSION}"
		env TERM="urxvt" \
			start-stop-daemon \
				--user ${BELONGS} \
				--exec /usr/bin/screen -- -S $CERTAIN -X quit
		eend $?

		fi

		rm -f $PIDFILE

	done
}

It should work on other Linux distros too, not only Gentoo :)