If a book has e. g. 100 chapters, the menu may be a little inconvenient for the user.
Open e.g.
http://tools.wmflabs.org/bookmanagerv2/wiki/Juggling/Basic_Tricks
and execute the following in the console:
for(i=1;i<100;i++)
$('div.mw-bookmanagerv2-nav-toc') .find('ol') .append('<li>Extra chapter '+i+'</li>');
you'll have to scroll the page to get to the last chapter, and I don't know if this is the better approach.
One alternative I can think of is to add just a few (10?) chapters to the list and insert an input box after that,
$('div.mw-bookmanagerv2-nav-toc')
.find('ol') .after('<input type="search" placeholder="Search chapter...">');
which the user could use to type the name of another chapter, and get suggestions as in Vector's search menu, which seems to use this module:
https://www.mediawiki.org/wiki/ResourceLoader/Default_modules#jquery.suggestions
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