Now in beta on Android & Desktop, coming soon to iOS:

Save custom nicknames & notes for anyone you’re chatting with on Signal, even if they aren’t in your phone’s contacts. Useful for adding missing letters in a lazy friend’s profile name or a reminder about where you met.

@signalapp I would love to have location sharing feature. So you can automatically send for a fixed time every few seconds your current location. That should then show on a map.