This extension allows selective transclusion of marked-off sections of text. Different pages can include or exclude selected sections; there can be arbitrary numbers of sections, which can also overlap arbitrarily.
This functionality is crucial for creating effective logical division of information from different pages. For instance, I have 20 sub-plugins each of each describes its unique import settings. It is useful to see that description on the plugin page but it is also useful to see the import settings of all the plugins on a designated page.
With this extension, it would be possible to have one page with all import settings (instead of 20) and transclude each section into the respective plugin page.