Faithbuilders Hello and welcome
#1 No, unfortunately a split-screen for the multiplayer was never developed.
#2 Yes, you can make custom scripts to have conversations with characters by text being displayed ( yes, you can make talk-bubbles using images that appear)
Here's a link to one set of scripts to get the idea...https://forum.thegamecreators.com/thread/65207
Quote: " real talking (through the speakers) "
If you mean pre-recorded voice ( like .wav files) and use that instead of text, then yes, that is done all the time.
Use the search feature at top and you'll find a lot of info on these subjects.
My games never have bugs. They just develop random features..
Lots and lots of random features...