As an FYI, the voiceline comments are there to alert NPCs to Henry's presence, so players cannot use Photo-Mode to reconnoiter their surroundings. As far as removing that feature? I'm sure it's possible to remove the voicelines while still alerting NPCs. Unfortunately, I'm not sure how, as of now.

Oh, really? so it has a function like that? Didn't know that. Havn't noticed that anyone was commenting on it or that I've alerted enemies while sneaking. Not sure if I've used it while sneaking near anyone though.