The list of shape files on the right-hand side is driven from Maps files but the list on the left if fixed.
Regarded the manual image placement, if you save the script to a script window, part of it will look like:
Add Image(
Set Blob( Char To Blob( "55685eJy ... gfOrroW", "base64compressed" ), "png" ),
Bounds( Left( 53.9375 ), Right( 69.6171875 ), Top( 165.5 ), Bottom( 73 ) ),
SetSize( {223, 185} )
)
The bounds are in graph coordinates and you can adjust them for precise image alignment.