And second one- Julius Nepos dies usually few days after start, maybe he could stay alive a little longer?
The most accepted date for his assassination is 25th April 480.
Yes it could be a bit early for the Norman- word. It's commonly though to have come into use only after the Vikings invasions and that means at the end of this mod's timeframe. However I am pretty sure I have seen a late-roman map of the region where the term 'Normannia' was present. That's when I decided to change 'Normandia' into 'Normannia'. By the way the area was already inhabited by norse people before the arrival of the Franks, there was a roman settlement called Otlinga Saxonia...
Of course that roman-time map with Normannia on it could have easily been unreliable or inaccurate.
I found this in the wiki:
In 406, Germanic and Alan tribes began invading from the West, while the Saxons subjugated the Norman coast.