Sigh. As usual, poking around I figured out how to do the tinting. Who knew they'd have the word "Sepia" in a menu.
And I figured out a decent (although not the best) method of adding the scratches. I cloned the picture into two layers, used the "frosted glass" effect on the cloned layer with the following settings:
Maximum Scatter Radius: 27.03
Minimum Scatter Radius: 5.89
Smoothness: 1
I put the cloned layer on top of the original layer, set the cloned layer's opacity to 62, and it seemed to turn out pretty nice.