Hi @ultramaximum
Did you solve the problem?
I saw in this post [Solved] Can't get around "Permission Denied" in Transmission - #31 by sam_nazarko that @sam_nazarko said that will be solve on the final Release.
I believe is some sort of configuration in transmission.service file of systemd, but I couldn’t figure out.
[Unit]
Description=Transmission BitTorrent Daemon
RequiresMountsFor=/media/NASDRIVE
[Service]
User=osmc
Group=osmc
Type=notify
ExecStart=/usr/bin/transmission-daemon -f --log-error
[Install]
WantedBy=multi-user.target