The Commands validator is a Service which determines which Commands should be executable. By default all Commands which implements the "Elements\Bundle\ProcessManagerBundle\ExecutionTrait" will be available.
You can change or alter the behaviour by changing the Service. If you want that all commands are available, change the $strategy to "all". Then no validation is done.
Elements\Bundle\ProcessManagerBundle\Service\CommandsValidator:
public: true
arguments:
$strategy: "default"
$whiteList: ["router:match","valid:command"]
$blackList: ["process-manager:maintenance","do-no-execute:command"]