Facebook display=popup

I've got a cognito user pool set up with facebook federated identity provider.
And everything works perfectly, from a technical angle.

However, my users think it looks ugly.

Here's why:

Cognito redirects the users to https://www.facebook.com/v2.9/dialog/oauth to do their sign-in.
However, that link loads up their whole facebook menu bar complete with friend requests and notifications in the background.

Fortunately, facebook provides an alternate link for signin, which is https://www.facebook.com/v2.9/dialog/oauth?display=popup (it's mostly the same, just has display=popup at the end). That link provides a proper authentication screen without all the background stuff, and it's even more compact, which is more suitable for the size of my website window.

Unfortunately, I can't see how to configure Cognito to including this display=popup parameter in the URL it sends users to.

Is there a way to do this that I'm missing?

If not, could it be added as a feature? (I imagine it'd be pretty straightforward.)