I understand it is not intended. However we were an old vbulletin forum that migrated and some of the users resent not being able to respond with just a ? or quoting the above poster with no other characters in the post.
I figured, that this functionality was something discourse was not going to support. So I was looking for direction to create a plugin that would allow this functionality. I will admit that my attempts were nothing above downloading the source code and searching for the error message. Oddly that didn’t even give me a result.