No, because it would ruin alignment.
It’s possible, but I thought 3 days isn’t long enough to make it useful. Anyone feel strongly otherwise?
Absolver doesn’t actually stop them from retaliating as such. However, a fully-charged Absolver also stops enemy projectiles, which is probably what you’re referring to. But if it’s not fully charged… 
Yes. And you better hope you don’t run into it. It’s… not easy.
No, can’t do this technically.