I undestand what you mean about keeping the camera in your hand at the ready. I made a custom hand strap that attaches to the right neck strap mount of the camera body and makes a big loop around the back of my hand with a leather pad. I have it adjusted so that when I pull up the camera to shoot, the strap actually supports a bit of the camera weight and the lower right corner of the camera body rests on the edge of my palm. Hard to explain ....but I really like the way it feels. It provides support and procection from a fall.
I have not used a neck strap for a few years. I got it caught twice on a few things when I was carrying the camera by the lens and almost lost it to a drop. Don't want to do that again, so I switched to the wrist strap. Plus, in my opinion, the D800 with the 70-200, 28-300 or 300 f/4 is too heavy for me to carry around my neck safely. A lot of guys like the Black Rapid type of straps but I have not yet gotten used to having my camera swinging around or perhaps knocking into door jams.
Dan (Nikon D800,V2,Sony HX400V,Lumix ZS40) "I don't read, I just look at pictures" - Andy Warhol