Shorewall users - Jul 2014 - executing a shorewalls script in lib.private from cmd line?

Reading

	http://shorewall.net/shorewall_extension_scripts.htm

I'm installing a number of convenience scripts in

	/lib.private

It's clear how they're referenced/invoked in the various shorewall
stages.

Is it possible to invoke a single script from the shorewall cmd line?

e.g., if

	/lib.private
		...
		setup_sysctls() {
			echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter
		}
		...

is there a shell cmd to effectively

	shorewall 'EXEC a PRIVATE SCRIPT' setup_sysctls

?

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