It is possible to set pw in transmission. or you can use download station. that uses transmission.
for plex it is only access via lan without a plex token.(from myplex)
DS412+ / DSM 4.2-3161 / 4 x ST3000DM001-9YN1 (SHR1)/LACP
cyberpower BS650E, 1x1,5TB external drive, 1x500GB external drive for backup.
Dir-655, DGS-1008D and a GS108v3
Apps: PLEX, cloud-, download station,DNS-, DHCP-, VPN server, web services, symform and HAproxy.