Hello,
I confirm what you say: QueueMetrics was created as a read-only tool in order to avoid any impact on the server, where you may configure things in a thousand different ways. To create queues and agents, we suggest a decxente GUI, like Voiceroute's Druid.
Of course, you do not want to do all the work wtwice: so QueueMetrics has a way to pull data from an existing set of Asterisk config files an set up automatically: this is the Configuration Wizard you see in the main page.