I've only ever seen two wingerons planes and they were both gliders. Now these both used full span pivoting wings but in both cases the amoung of movement required was very slight to achieve strong roll rates. So perhaps you're onto something here. But I have to add that I think you'd be better off with a longer percentage of the span. 1/6 means it would be a very short span section. I'd shoot for 1/3 of a wing panel. Or perhaps that's what you meant when you said 1/6 span? 2 x 1/6 equals the outer third of each panel?