hi all,
i realized a modified version of Nook ePub reader application. Its main purpose is to allow using custom fonts other than the 3 default ones (i.e. Amasis, Helvetica and Light Classic).
But, as a bonus feature, this version also solvea the TOC issue mentioned in this thread. With this version, the TOC is loaded up to level 3 (that i suppose it's the behaviour of previous firmware). This should be enough, but in case is needed, it would be possible to increase it up to any leve with a slight modification.
You can find the files and the install procedure on
my blog.
Of course, you will need to have a rooted firmware based on original 1.5.0 (like for instance the softroot 2.5.1 by Perfinion).