Hi t1mmem, sorry for the late response, I've been out of the country for a bit.
You could take one of two approaches here:
You could modify the plugin to fire an event when an li becomes active. Your bubble triggerer could listen for this event and behave accordingly. I'd be happy to accept that as a pull request (or I could even do it myself) if you end up going this route.
You could just check which item is selected ever 150ms. This sucks because you have to run code 8 times a second, but then you don't have to modify the plugin.
I'm trying to add a tooltip style bubble on li.active if it has focus for longer than 150ms.
Maybe this is already possible?
Thanks for a fantastic plugin, it's doing so many things so right!