Extensions region TODO
The Extensions administration region is not an out-of-the-box feature. It appears to the higher user roles if any of the admin-side plugins that employ it are installed.
When relevant, the Extensions administration region will be seen in the administration navigation from all admin-side views except when you are in context of the Plugins panel, even for the administrator. This behaviour ensures being able to safely deactivate and/or remove outdated or buggy plugins if they are causing problems. To access the Extensions panels from the Plugins panel, move to anywhere else in the admin-side first, and the *Extensions region will appear in the navigation again.
Plugins that use the Extensions region
When you upload a plugin that uses the Extensions region, a new panel option will appear under the region that provides the plugin’s associated functionality or configuration controls. The following table identifies the supported plugins that will do this, and their corresponding panel labels. (Orphaned or otherwise abandoned plugins are not listed here, intentionally.)
Unconventional panel placement
The use of the Extensions region is a convention adopted by plugin developers to put administration-side plugin preferences and other functional controls in a logical place, and that’s a good thing when it can be done.
Not all administration-side plugins use the Extensions region, however. Some plugins will add their associated admin-side panel in one of the core regions. This may happen when panel placement is decided with respect to functional context over convention. Another reason may be a concern for having too many plugin panels under the Extensions region, though this is likely a moot issue for most Textpattern users.
Either way, it can be a little confusing when your hunting for plugin panel functionality and it’s not where you expect it to be. The issue is still evolving and plugin developers will likely settle on a standard process eventually, as well on a convention for creating plugin panel labels.