I discovered by chance today that the NRSV TOC allows the user to expand chapter nodes and see subnodes for pericopes:

This is great. Wondering whether somehow I had missed that with regard to other Bibles I used or whether it was a new feature, I checked the NASB and ESV. The chapter nodes are not expandable to pericope titles. Since the latter have pericopes titles, I was wondering why the functionality of the NRSV TOC is not extended to them (and whichever other Bibles to which it may be applicable)?