Adding new creatures during a session

1) So I pull a creature out of my library and stick it in my FOW box so my players can't see it. Then I roll its hit points. While my players can't see the result of my roll, because I have that hidden, they can see what I am rolling. It would be nice if the Hide Rolls option would completely hide what the GM is rolling. When the players see "Judge [GM] rolls a 12d10+96 for a ? " that gives them a clue as to how tough the encounter is about to be.

2) Watching Owlbear's well done shadow casting videos, he mentioned that you're planning to implement an automatic stealth roll/check to see if a creature is revealed by a light source. If something like that is possible, it makes me wonder if it would be possible for d20Pro to auto roll and apply hit points to creatures when spawned onto the map from the library.