Camera Mods or just other camera apps that have more settings exposed?
I've seen this camera mod that can up the frame rate on video's etc... http://forum.xda-developers.com/show....php?t=2778570
Edit - here is another one that might be a little better..... http://www.droidviews.com/jishnus-camera-mod-for-lg-g3/
For a camera app substitute, I use A Better Camera
. It exposes (no pun intended) a lot more settings like ISO control, White Balance, Exposure Compensation, Shooting Modes, etc, etc. All this with the free version of the app too. I haven't even tried the paid version yet!
I'm also using G3 TweaksBox module and have changed the stock "Long Volume Down" press to open ABC instead of the stock camera app. There may be other ways to do this, but since I'm running G3TB for other tweaks, it was simple to add this one too.