You can define new statuses and even reorder existing statuses here. Warning: do not delete any of the default statuses. If you do, RT breaks horribly.
RT comes with a development mode setting. As a convenience for developers, this setting turns on all sorts of development options that you most likely don't want in production.
It turns off Mason's static_source directive. By default, you can't edit RT's web interface components on the fly and have RT pick up your changes.