Bonsoir à tous.
J'ai résolu mon problème : c'était bien la syntaxe qui posait problème.
Sur le git de rtorrent j'ai pu trouver une syntaxe qui fonctionne, voilà ce que ça donne :
network.scgi.open_port = 127.0.0.1:5001
encoding.add = UTF-8
network.port_range.set = 45000-65000
network.port_random.set = no
pieces.hash.on_completion.set = no
directory.default.set = /home/garrus/torrents
session.path.set = /home/garrus/.session
protocol.encryption.set = allow_incoming, try_outgoing, enable_retry
schedule2 = watch_directory_1, 5, 5, ((load.start, /home/garrus/watch/Films/*.torrent, "d.custom.set = watchdir, /home/garrus/watch/Films/", "d.directory.set = /home/garrus/torrents/Films/"))
schedule2 = watch_directory_2, 5, 5, ((load.start, /home/garrus/watch/Films_HD/*.torrent, "d.custom.set = watchdir, /home/garrus/watch/Films_HD/", "d.directory.set = /home/garrus/torrents/Films_HD/"))
schedule2 = watch_directory_3, 5, 5, ((load.start, /home/garrus/watch/Livres/*.torrent, "d.custom.set = watchdir, /home/garrus/watch/Livres", "d.directory.set = /home/garrus/torrents/Livres"))
schedule2 = watch_directory_4, 5, 5, ((load.start, /home/garrus/watch/Logiciels/*.torrent, "d.custom.set = watchdir, /home/garrus/watch/Logiciels/", "d.directory.set = /home/garrus/torrents/Logiciels/"))
schedule2 = watch_directory_5, 5, 5, ((load.start, /home/garrus/watch/Musiques/*.torrent, "d.custom.set = watchdir, /home/garrus/watch/Musique/s", "d.directory.set = /home/garrus/torrents/Musiques/"))
schedule2 = watch_directory_6, 5, 5, ((load.start, /home/garrus/watch/Private/*.torrent, "d.custom.set = watchdir, /home/garrus/watch/Private", "d.directory.set = /home/garrus/torrents/Private/"))
schedule2 = watch_directory_7, 5, 5, ((load.start, /home/garrus/watch/Series_VF/*.torrent, "d.custom.set = watchdir, /home/garrus/watch/Series_VF/", "d.directory.set = /home/garrus/torrents/Series_VF/"))
schedule2 = watch_directory_8, 5, 5, ((load.start, /home/garrus/watch/Series_VOSTFR/*.torrent, "d.custom.set = watchdir, /home/garrus/watch/Series_VOSTFR/", "d.directory.set = /home/garrus/torrents/Series_VOSTFR/"))
schedule2 = untied_directory_1,5,5,stop_untied=/home/garrus/watch/Films/*.torrent
schedule2 = untied_directory_2,5,5,stop_untied=/home/garrus/watch/Films_HD/*.torrent
schedule2 = untied_directory_3,5,5,stop_untied=/home/garrus/watch/Livres/*.torrent
schedule2 = untied_directory_4,5,5,stop_untied=/home/garrus/watch/Logiciels/*.torrent
schedule2 = untied_directory_5,5,5,stop_untied=/home/garrus/watch/Musiques/*.torrent
schedule2 = untied_directory_6,5,5,stop_untied=/home/garrus/watch/Private/*.torrent
schedule2 = untied_directory_7,5,5,stop_untied=/home/garrus/watch/Series_VF/*.torrent
schedule2 = untied_directory_8,5,5,stop_untied=/home/garrus/watch/Series_VOSTFR/*.torrent
schedule2 = espace_disque_insuffisant,1,30,close_low_diskspace=500M
trackers.use_udp.set = yes
dht.mode.set = off
protocol.pex.set = no
throttle.min_peers.normal.set = 40
throttle.max_peers.normal.set = 100
throttle.min_peers.seed.set = 10
throttle.max_peers.seed.set = 50
throttle.max_uploads.set = 15
execute2 = {sh,-c,/usr/bin/php /var/www/rutorrent/php/initplugins.php garrus &}
Voilà voilà problème résolu