transmission-vise.py for Netgear ReadyNas 10400. run's by crontab every 2 hours
how it works:
stop torrent if ratio has been reached or seeders>MAXSEEDERS
start torrent if only my seeding

what's all this:
Netgear ReadyNas 10400 is slow,  but most importantly - hot and noisy at his place, but most of all - if seeding more torrents, it can't share plex because low cpu one core speed.

note:
crontab must run script w/o dots
do like this in /etc/crontab:
/2 *    * * *   root    /root/scripts/transmission-vice_py

#!/usr/bin/python
from os import popen
from sys import exit
import re
import logging

logging.basicConfig(filename='/root/scripts/transmission-vice.log', format='%(asctime)s - %(message)s', level=logging.INFO)

maxratio = 5
maxseeders = 3
unknowndata = 0
tarray = []
rawtorrents=popen('transmission-remote 8181 -l | egrep -v "ID|Sum"').read()

for torrent in rawtorrents.split("\n"):
    if len(torrent)==0:
        break
    spltorrent=torrent.split()
    torrentdict={'ID':spltorrent[0],'Done':spltorrent[1],'ETA':spltorrent[4],
                 'Ratio':spltorrent[7],'Status':spltorrent[8],'Name':' '.join(tuple(spltorrent)[9:])}
    torrentstats=popen('transmission-remote 8181 -t'+torrentdict['ID']+' -it').read()
    stat = re.findall(r"(\d+)\sseeders",torrentstats)
    if len(stat)>0:
        torrentdict['Seeders']=stat[0]
    else:
        torrentdict['Seeders']=unknowndata
    stat = re.findall(r"(\d+)\sleechers",torrentstats)
    if len(stat)>0:
        torrentdict['Leechers']=stat[0]
    else:
        torrentdict['Leechers']=unknowndata
    tarray.append(torrentdict)

for torrent in tarray:
    print("Name:"+torrent["Name"]+" Status:"+torrent["Status"]+" Ratio:"+str(torrent["Ratio"])+" Seeders:"+str(torrent["Seeders"])+" ETA:"+str(torrent["ETA"]))
    peers = popen('transmission-remote 8181 -t'+torrent["ID"]+' -ip' + ' | egrep -v "Address"')
    peerasseeder = False
    for peer in peers:
        if int(float(peer.split()[2])) == 100:
            peerasseeder = True
    if int(torrent["Seeders"])<maxseeders and int(torrent["Leechers"])!=0 and not peerasseeder and float(torrent["Ratio"])<maxratio:
        if torrent["Status"]=="Stopped":
            result=popen('transmission-remote 8181 -t'+torrent["ID"]+' -s').read()
            logging.info("start:"+torrent["Name"]+" Ratio:"+str(torrent["Ratio"])+" Seeders:"+str(torrent["Seeders"]))
    elif  (peerasseeder or int(torrent["Seeders"])>3) and torrent["ETA"]=="Done" and float(torrent["Ratio"])>maxratio:
        if torrent["Status"]=="Idle" or torrent["Status"]=="Seeding":
            result=popen('transmission-remote 8181 -t'+torrent["ID"]+' -S').read()
            logging.info("stop:"+torrent["Name"]+" Ratio:"+str(torrent["Ratio"])+" Seeders:"+str(torrent["Seeders"]))
exit(0)