Thunder: Custom configuration section
 You can create a custom configuration section in your Sitefinity CMS web application or class library
 
To do this, perform the following:
  - Select the folder where you want to put your custom module.
  - Open its context menu and click Add » New Item…
  - In the left pane, select Sitefinity CMS and in the central pane, select Sitefinity CMS Configuration Section. 
    A new configuration section is created.   
 You can register the configuration from a module that you have previously created or from the Global.asax, if you want to use it without a module.