Some notes on the features you can enable by going to Settings->Labs

Be warned! Labs features are not finalised, they may be fragile, they may change, they may be dropped. Ask in the room if you are unclear about any details here.

Message pinning (feature_pinning)

Allows you to pin messages in the room. To pin a message, use the 3 dots to the right of the message and select "Pin".

Custom status (feature_custom_status)

An experimental approach for supporting custom status messages across DMs. To set a status, click on your avatar next to the message composer.