Just install "Manual Camera" app.
I saw a review video where they moved from the native app over to Manual Camera.
Plenty of tweaking available via that app.
Actual use of this type of feature is totally personal. For me, I really want to have a pro mode, just like I like I really need to have tons of storage space. I had both with my N7 and N5. Never once used pro mode on those phones, and my storage eternally remains almost unused. But somehow, I'll be let down a bit if my phones don't have these things at time of purchase. Funny, but that's just me.