Just came back from looking at the Nauticam and Recsea for the Sony RX`-100. Even took my gloves in with me. I found I did not like the feel of the shutter release on the Recsea even though it has several features I like. The Nauticam I found the dial that controls the f-stop and shutter speeds was too close to the thumb hold causing me to move it just moving my hand around a bit.
In California we pretty much always have surge so I do a lot of one handed photography holding my rig in my right hand and one finger to stabilize on a rock with my left hand. I can't see being able to do that without moving that dial. Are people having trouble with this? Does the camera possibly have a way to change to function of that dial and move f-stop/ shutter control to a different dial?