I'm not following you here, Eric. The front of the S/Cl/Ch dial is deeply ridged. I depress that little release button with my left thumb, and spin the dial from the front with my left index finger. Give it a try, you might find it works for you too. Of course there is nothing wrong with using both hands it that feels better for you.
My own favorite new feature isn't really new to most users, but it is for me. I like LiveView mode for shooting close to the ground. I have spent a lot of time on my belly in the past, craning my neck to see into the viewfinder, only to find out my horizon is crooked after the fact. Live view mode lets me spend as much time as I need to get everything just right without having to be a contortionist.