The following review has been posted through the commitfest application:
make installcheck-world: tested, passed
Implements feature: tested, passed
Spec compliant: tested, passed
Documentation: tested, passed
Patch looks good to me, and work fine on my machine. One minor observation is option 'list' mostly used to list the elements like "pgbench -b list" shows the available builtin scripts. Therefore we should use a word which seems to be more relevant like --show-script.
The new status of this patch is: Waiting on Author