In version 5, coming soon, we've implemented some smarter logic for switching sectional maps. In a nutshell, the system is now aware of which area of a sectional chart has map vs. legend, and it will make better default sectional map selections. And you shouldn't find yourself flying on legend data any more.
It's not a seamless chart, but this should improve things for those of you on the boarder areas.
-Walter
I found this thread and was wondering whatever happened to the idea of seamless sectionals... sure would be great!