The command line arguments accepted by the Python client (and its derivatives) are as follows:

--max_uploads <arg>

the maximum number of uploads to allow at once. (defaults to 4) Note that this does not affect the number of connections, only the number of simultaneous unchoked uploads.

--keepalive_interval <arg>

number of seconds to pause between sending keepalives (defaults to 120.0)

--download_slice_size <arg>

How many bytes to query for per request. (defaults to 16384)

--request_backlog <arg>

how many requests to keep in a single pipe at once. (defaults to 5)

--max_message_length <arg>

maximum length prefix encoding you'll accept over the wire - larger values get the connection dropped. (defaults to 8388608)

--ip/-i <arg>

ip to report you have to the tracker. (defaults to '')

--minport <arg>

minimum port to listen on, counts up if unavailable (defaults to 6881)

--maxport <arg>

maximum port to listen on (defaults to 6999)

--responsefile <arg>

file the server response was stored in, alternative to url (defaults to '')

--url <arg>

url to get file from, alternative to responsefile (defaults to '')

--saveas <arg>

local file name to save the file as, null indicates query user (defaults to '')

--timeout <arg>

time to wait between closing sockets which nothing has been received on (defaults to 300.0)

--timeout_check_interval <arg>

time to wait between checking if any connections have timed out (defaults to 60.0)

--max_slice_length <arg>

maximum length slice to send to peers, larger requests are ignored (defaults to 131072)

--max_rate_period <arg>

maximum amount of time to guess the current rate estimate represents (defaults to 20.0)

--bind <arg>

ip to bind to locally (defaults to '')

--upload_rate_fudge <arg>

time equivalent of writing to kernel-level TCP buffer, for rate adjustment (defaults to 5.0)

--display_interval <arg>

time between updates of displayed information (defaults to 0.5)

--rerequest_interval <arg>

time to wait between requesting more peers (defaults to 300)

--min_peers <arg>

minimum number of peers to not do rerequesting (defaults to 20)

--http_timeout <arg>

number of seconds to wait before assuming that an http connection has timed out (defaults to 60)

--max_initiate <arg>

number of peers at which to stop initiating new connections (defaults to 40)

--check_hashes <arg>

whether to check hashes on disk (defaults to 1)

--max_upload_rate <arg>

maximum kB/s to upload at, 0 means no limit (defaults to 0)

--alloc_pause <arg>

seconds to wait before displaying allocation feedback (defaults to 3.0)

--snub_time <arg>

seconds to wait for data to come in over a connection before assuming it's semi-permanently choked (defaults to 60.0)

--spew <arg>

whether to display diagnostic info to stdout (defaults to 0)