There are some config values that haven't found their way into the administration page.
This has several reasons.
Maybe they are part of a current development that isn't considered stable and will be added later in the administration page when it is considered safe.
* **auth_cookie_lifetime** (Integer) - Number of days that should pass without any activity before a user who chose "Remember me" when logging in is considered logged out. Defaults to 7.
* **config_adapter** (jit|preload) - Allow to switch the configuration adapter to improve performances at the cost of memory consumption. Default value is "jit"
* **instances_social_key** - Key to the API of https://instances.social which retrieves data about mastodon servers. See https://instances.social/api/token to get an API key.
* **max_connections** - The maximum number of database connections which can be in use before the worker process is deferred to it's next interval. When the system can't detect the maximum numbers of connection then this value can be used.
* **max_connections_level** - The maximum level of connections that are allowed to let the worker start. It is a percentage value. Default value is 75.
* **session_handler** (database|cache|native) - Whether to use Cache to store session data or to use PHP native session storage. Default value is `database`.
* **cache_driver** (database|memcache|memcached) - Whether to use Memcache or Memcached to store temporary cache. Default value is `database`.
* **profiler** (Boolean) - Enable internal timings to help optimize code. Needed for "rendertime" addon. Default is false.
* **free_crawls** - Number of "free" searches when "permit_crawling" is activated (Default value is 10)
* **crawl_permit_period** - Period in seconds between allowed searches when the number of free searches is reached and "permit_crawling" is activated (Default value is 60)
* **png_quality** - Default value is 8.
* **proc_windows** (Boolean) - Should be enabled if Friendica is running under Windows.
* **proxy_cache_time** - Time after which the cache is cleared. Default value is one day.
* **pushpoll_frequency** -
* **qsearch_limit** - Default value is 100.
* **relay_server** - Experimental Diaspora feature. Address of the relay server where public posts should be send to. For example https://podrelay.net
* **relay_subscribe** (Boolean) - Enables the receiving of public posts from the relay. They will be included in the search and on the community page when it is set up to show all public items.
* **relay_scope** - Can be "all" or "tags". "all" means that every public post should be received. "tags" means that only posts with selected tags should be received.
* **relay_server_tags** - Comma separated list of tags for the "tags" subscription (see "relay_scrope")
* **relay_user_tags** (Boolean) - If enabled, the tags from the saved searches will used for the "tags" subscription in addition to the "relay_server_tags".
* **remove_multiplicated_lines** (Boolean) - If enabled, multiple linefeeds in items are stripped to a single one.
* **show_unsupported_addons** (Boolean) - Show all addons including the unsupported ones.
* **show_unsupported_themes** (Boolean) - Show all themes including the unsupported ones.
* **show_global_community_hint** (Boolean) - When the global community page is enabled, use this option to display a hint above the stream, that this is a collection of all public top-level postings that arrive on your node.