Since it actually moves the scroll bar and does not emulate key inputs you can type and use key shortcuts without problems.
The following actions stop the script:
- changing between Fullscreen and Non-Fullscreen View
- changing into Style Template View
- starting the "Stop Typewriterscrolling" script
You can, however, change between Draft View and Page View (even in Fullscreen Mode). The script has no effect in Page View, but it does not stop either.
Problem: As you might have noticed, the script keeps you at the end of the document, so you can't have Typewriter Scrolling while editing something further up. But there is a good reason for that: This is the first time I ever used Apple Script and I have no idea what I am doing. Also, Typewriters couldn't edit written text at all, so this actually makes it a bit more authentic.
Feel free to edit and improve these six lines of code, but please re-upload, so everyone can profit

Downloads:
http://www.filedropper.com/starttypewriterscrolling
http://www.filedropper.com/stoptypewriterscrolling
Installation:
I just threw them in my Nisus Documents Folder (the Document Manager Directory) in a sub-folder and NPW lists the in a submenu und Macros.
Regards
Chrow