MRF idea ​

When a local user replies to a post with nothing but a single custom emoji then either

It also makes the user react with the custom emoji
It instead makes the user react to the post with the custom emoji

Whether or not it posts the status can be a config flag. Hell, also add a flag for local users only or all users too. It also would need to ignore @’s.

Actually, might as well include Unicode emojis too or make it a config flag. That way it can be a full compatibility layer for emoji reactions for clients that don’t support it.

Could also make ignoring the @’s a config flag that way you can have options B and still be able to reply to people with an emoji.