If you are talking about having a visor contour restricting the FOV then the answer will be a big fat no. This was already tried in early days of MO1. It was a terrible idea and almost everyone hated it.
The reality is that nobody likes a restricted FOV. The novelty of the visor contour is very quickly replaced with the annoyance of having terrible peripheral vision.
Steam Community: Mortal Online. Back in the old days
steamcommunity.com
There you can see an old video of when MO1 tried the soft visor contour. Each visor was different but you get the idea. Even with a soft contour (or shadow contour) it was a no go. Nobody liked it and the whole community requested it be removed.