Slideshow photos fill (not fit) frame on import?

Creating a slideshow (with effects) in Premiere Pro CC with a square aspect ratio. Importing photos of all different sizes, resolutions, and aspect ratios. How can I import them to automatically FILL (not fit) the sequence square (1:1) frame without having to scale them up or down manually to remove letterboxes or pillarboxes? Again, I don't mind repositioning manually as necessary but I do not want to rescale them manually to remove the black pillar/letterboxes. Under Preferences > General I know you can select the "Default Scale to Frame Size" which then fits the photo within the frame, but if the original aspect ratio differs from the sequence frame aspect ratio, pillar or letterboxes occur. I don't mind repositioning a few photos to center the subject, but I don't want to rescale hundreds of photos to accomplish this.

Another way to ask the question is: is there a workflow to accomplish the same thing in a single step for hundreds of photos without doing each photo individually if it cannot be done on import?