This is what twiddle.sh --help gives in 6.0 CR1:
./twiddle.sh --help
A JMX client to 'twiddle' with a remote JBoss server.
usage: twiddle.sh [options] <command> [command_arguments]
options:
-h, --help Show this help message
--help-commands Show a list of commands
-H<command> Show command specific help
-c=command.properties Specify the command.properties file to use
-D<name>[=<value>] Set a system property
-- Stop processing options
-s, --server=<url> The JMX service URL of the remote server (e.g. service:jmx:rmi:///jndi/rmi://localhost:1090/jmxrmi)
-o, --host=<HOSTNAME> The name of the remote server (e.g. localhost)
-r, --port=<PORTNUMBER> The rmiRegistryPort of the remote server (e.g. 1090)
-u, --user=<name> Specify the username for authentication
-p, --password=<name> Specify the password for authentication
-q, --quiet Be somewhat more quiet
-v, --verbose Be noisy
for convenience, you can specify --host and --port but not with the --server=<url> which overrides host + port.
Notice what it says for the -s param.