This would be nice. Instead of a ... for more options use the same icon as for chat. . And also have a setting for banned reactions so emojis that can be considered toxic are unable to be used.
However complexity will probably be around {{emoji-picker}}, might be the right time to move it from something we pull in various components, to something which is globally available. We would need to have it in body (mostly empty until first use) and use this one instance in every cases. Position would need to happen through popper most likely. I would recommend we do this task first, it will make this easier and also improve things in chat.