Add some kind of progress indication

I think this should be a feature request since the module actually fetches the core login form to display in the popup and since the core login form doesn't have a progress indicator, the popup form doesn't either. It's expected behavior, not a bug as far as I know.

We'll have to add in some custom ajax functionality to implement this

The core form doesn't because it's the whole browser page, so submitting a form gives you the normal feedback of a POST - the spinning wheel of internet delay etc. I get why it seems like a feature request, but I would never give this to my users without something to tell them "yes the form was submitted, please wait".

I wonder if there is some common way that this works for modal popups.