Writing a small update since this post was mentioned in @dgtziea’s thought-provoking thread about empathy mechanics in IF!
Dysfluent is not in its final state yet but the fabled text speed slider has been implemented and various small things have been fixed/optimized.
I’m too busy working on my IFComp2024 entry (and resisting the call of Slay the Spire) right now to contribute much to the conversation going on over there, but I look forward to checking up on it soon as it’s a fascinating topic! 
It’s making me want to play or replay the games mentioned; it’ll be great to view them through this particular design lens.