or, if people decide to /self in the middle,visible pops out of the shadows and says, "Boo!"
X pops out of the shadows and says, "Boo!" [Visible]
while defaulting to the current system echo if they choose not to RP out the emote.visible Popping out of the shadows, /self says, "Boo!"
Popping out of the shadows, X says, "Boo!" [X] [Visible]
EDIT: The thing which made me think about this is, typically if I'm popping out of visible it's because I want to RP to the room. It's very awkward to visible, then have people able to react to my presence prior to the emote, so I have typically written the emotes in advance and done the copypaste dance, while I feel like it could be streamlined like with cloaks.