Had a similar need recently, and came across your plugin. Unfortunately, the current version does not meet my needs, and here's why:
a) Several jquery based menu behaviors require list item IDs to be numbered. This is currently not an option with Classy. Possible to add? ex: id="somePrefix1" id="somePrefix2" and so on.
b) The above presumes an separator option of "None ()", would require changing the default separator code on line #138, and adding the separator option of None() to the existing.
c) Last thing; please don't leave those 5 entries in my database after de-activation. I know a lot of plug-in devs don't bother to clean up after themselves, some as a convenience in the case user wants to re-activate, but it is very narrow thinking if you consider the number of plugins out there. Clutter quickly builds up.
Thanks for sharing the plugin in any case! :)