@shel Thanks for noticing CW and "post scope" for #Mastodon.
"CW" (Content warning) is just a message title, which Mastodon uses (today) as a spoiler to hide a "toot"?! I agree, the option to add a title is really needed as it is supported at least by Mastodon and #Pump.io.
Post scope, as I see, is a simplified way to select the message recipients. The feature is actual for Pump.io also (which has Public and Followers predefined groups of recipients), so I will plan this also.