I think I've created the necessary things needed to do this.
1. text needs to be set as background text.
2. you need to create an action part "wait until x character stops talking"
3. you will need an overlay interface to prevent the player from being able to click on anything. I have actually written a tutorial for that which you can find here
, but unfortunately it seems I've not provided any resource files or finished typing up the tutorial, but should be able to figure it out from the screenshots anyway.
4. I wrote a script a couple years back which lets you kill background texts, which you can find here
I think you should be able to sort out what you are wanting with this information. I want to do the same thing with the game I'm working on too as I don't like the cursor being hidden whenever text is shown or a cutscene is triggered.