Emojis can be changed from the scribblehub typical emotes. This feature would be great for those who don't prefer to talk, and if an author, or perhaps other readers would like to see a shared emotional opinion on the events of a chapter, one could simply "tap" on what they think.
Authors would prefer to know how their chapter is going, and this feature appeals to the majority of the Scribble audience "non-talkative", so being able to express what one would think of a chapter without talking and through a click of a simple button would be amazing!