I would love to see a detailed example of a Soil NavWalker with dropdowns.
Using the above links and info I was able to quickly reinstate the Bootstrap menu, however implementing other menu options have been elusive.
I was able to install slicknav relatively easily with bower:
But it's really only designed for mobile or maybe tablet-style menu.
Flexmenu also installed fairly easily, but there seemed to be a lot of CSS conflicts:
At this point I'm back to the Bootstrap nav.