You know I love what you have done already, so I won't go on about that... but I really do love it!
Regarding your dilemma of adding a 3rd option to the presentation settings, my feeling is that people tend to use one type of view and stick to it, so perhaps you don't need to list the options in the top bar, but rather in the settings, where the three options would be easier to present clearly.
I think people don't mention it in the group because we love all the other features enough to keep us here and in time one always gets used to what one has available. But what seems to be happening is that some people don't adopt SteemPeak because they don't see this option, and therefore don't make it to the group.