my rtorrent config

.rtorrent.rc

# .rtorrent.rc - my rtorrent config
# for more info see:
# http://libtorrent.rakshasa.no/rtorrent/rtorrent.1.html

session = ~/.rtorrent

encryption = allow_incoming,try_outgoing,enable_retry

dht = off
dht_port = 16881

port_range = 16800-16900
port_random = no

use_udp_trackers = yes
peer_exchange = yes

download_rate = 800
upload_rate = 25

max_uploads = 1

min_peers = 40
max_peers = 100
min_peers_seed = 1
max_peers_seed = 1

check_hash = yes

directory = ~/incoming/.torrent/incomplete

schedule = queue,0,30,"execute=~/bin/rqueue"
schedule = watch,5,30,"load_start=~/incoming/.torrent/active/*.torrent"
schedule = untie,5,30,"remove_untied="
schedule = space,5,60,"close_low_diskspace=500M"

system.method.set_key = event.download.finished,rm_torrent,"execute=rm,$d.get_tied_to_file="
system.method.set_key = event.download.finished,mv_torrent,"execute=mv,-u,$d.get_base_path=,~/incoming/ ;d.set_directory=~/incoming/"

rqueue

#!/usr/bin/env ruby
# rqueue - rtorrent queue

module Rqueue
  class << self
    def go!
      @maximum = 4
      @pending = expand('~/incoming/.torrents')
      @running = expand('~/incoming/.torrents/active')

      if torrents(@running).count < @maximum
        oldest_file = String.new
        oldest_time = Time.new
        torrents(@pending).each do |torrent|
          if age(torrent) < oldest_time
            oldest_file = torrent
            oldest_time = age(torrent)
          end
        end
        start(oldest_file) unless oldest_file.empty? 
      end
    end

    def expand(path)
      File.expand_path(path)
    end

    def torrents(path)
      Dir.glob(expand(path) + "/*.torrent")
    end

    def age(file)
      File.stat(expand(file)).mtime
    end

    def start(file)
      `mv \"#{file}\" #{@running}`
    end
  end
end

Rqueue.go!