Hey @GIdenJoe . Make sure you Make a Wish, and log a Feature Request with your Meraki Sales or Account team. Posting here is not an official way to request anything from Meraki (though a lot of Meraki folks read the community so it does at least get into their brains on some level).
Regarding the EF queue I do echo your requests for some kind of feedback loop so we can see that it's working, and what it is doing. But that said, in our lab testing here it pretty much does exactly what it advertises. It's a priority queue for EF traffic.