extension.js

function(ticket, event, callback) {
   if (event.entity === 'ticket' && event.name === 'created' && !ticket.status) {
      if (ticket.tags.indexOf('priority-support') ||
          ticket.tags.indexOf('standard-support') ||
          ticket.tags.indexOf('enterprise-support') ||
          ticket.tags.indexOf('priority-sales') {
            ticket.status = 'normal';
          }
      }
   }
   callback(null, ticket)
}