Glad you enjoyed it and Thank you for taking the time to write a long suggestion!
I'll write my opinion on them, but naturally these are not final so they may change:
1. Maybe. Originally I decided not to add an option to instantly finish dialogs.
2. You always react to the first message, but I am still deciding whether or not it is wise to not let the player see what it was.
I want the player to fail and feel like they need to pay more attention, thinking that spam clicking is bad.
Failing can also create funny moments.
3. Yeah. I didn't wanted to add a way to recover from those cases, but a way to make the Dungeon fail quicker could be good.