System Config allows you to store system related configurations.
You can select your default Locale, Timezone, Date & Time formats here.
If you script deals with currencies, you can select all the allowed currencies & also select a default currency.
Mint Invoice is fully white-label solution. You can change the footer credit to your own. You can also show/hide the version number in the footer credit text.
The maintenance mode put the system under maintenance. During this period only admin user will be able to login.