To allow a role to see the configuration of a particular type of plugin (for example a activity module plugin), we are currently forced to give the capability "moodle/site:config", but this allows the user to access to all plugin type configurations. 

With our code change, we could give the capability "moodle/modsettings:config" to allow users to see the activity modules configuration without giving them all other configurations.

The same goes for the other types of plugins.

We have opened a pull request on a moodle clone on our github : https://github.com/DevEticeo/moodle/pull/1/files