Hi, Mark:
I am looking for this option as well. I am using Max Mega Menu and it only allows for one menu to be sticky. I need both top menus to be sticky per client request.
I will definitely donate once you roll this out.
One note: When I applied your plugin to the containing element above my Max Mega Menu navbar, it disabled the stickiness of the Max Mega Menu navbar. Then, when I uninstalled your plugin, Max Mega Menu’s sticky functionality wouldn’t work anymore even after purging cache, logging out, cycling functionality, etc. I did a backup recovery to fix this. It’s not a huge issue – just some feedback.
It is likely that I would keep Max Mega Menu’s sticky functionality turned off and just use your plugin for both containers once you roll it out. That way, less likely to conflict.
Thanks for all you do!