Program to resume all your transmission torrent downloads when your computer is idle and pauses when it's active!

Hai, Recently I changed my broadband plan to unlimited. The new plan is much slower than the old one and I can't browse pages smoothly when my torrents are active. So I have to pause all downloads when I'm using my computer and resume before I go somewhere. The problem is, most of the times I forgot to do this; At last I decided to write a program to automate it :)

You must enable your screensaver before running this program and turn on the web client of transmission torrent [ edit > preferences > web ]

# This program automatically resumes your transmission torrent downloads 
# when your computer is idle and pause when its active. 
# ( you must enable your screensaver and turn on webclient of transmission torrent ) 
# [ Author : Sreekumar ] 
# 
# 
import gobject
import dbus
import os
from dbus.mainloop.glib import DBusGMainLoop

DBusGMainLoop(set_as_default = True)
session_bus = dbus.SessionBus()

def stateChanged(state):
    #state : represents wheather the screensaver is avtive or not
    if state == 1:
        print "Resuming Downloads..."
        #resumes all transmissions 
        os.system("transmission-remote --torrent all --start")
    else:
        print "Downloads Paused!"
        #pause all transmisssions
        os.system("transmission-remote --torrent all --stop") 

session_bus.add_signal_receiver(stateChanged,"ActiveChanged","org.gnome.ScreenSaver")

#this is to check for new events from each of the event sources and dispatch them
mainloop = gobject.MainLoop()
mainloop.run()

Hope you like it :)