Favea

You're basically trying to use a verb form of susurration and susurrous, yes? I don't think that's acknowledged as existing in the English language by any major dictionary. Even if if were, I don't see any reason why it would suddenly be spelled a double s, an e and a single r. Just say 'whispering'. Even English native speakers are more likely to understand words that are actually documented.

Yes, a little bit. Pay attention to what game each mod is for. The one you link presumably won't do you any good because it is for Skyrim.