I've spent more time looking at the efficiency/performance of the Papywizard Import filter and find some strange behaviour with CP detection.
It sometimes seems to fail to detect CPs on image pairs where you would expect it to find good CPs.
The test image set shot using Merlin/Papywizard, Nikon D40 with kit zoom 18-mm set at 35mm (52.5mm equiv.) at lowest res (about 1MP) and basic quality JPEG. A mosiac of 9 rows and 10 columns - 90 images in total.
Image set available here:http://www.three60views.org.uk/image_sets/merlin-mosaic-front-90.zip
Screenshot 1 - shows image placement.
Screenshot 2 - shows portion of rendered (spline36/multiband) pano displaying obvious stitch errors on car.
Screenshots 3 and 4 - shows Links made during import/detection - missing links between image adjacent images in area of the car and roof of neighbouring house.
Screenshots 5-7 - show image pairs where program failed to detect CPs, or failed to place CPs where you would expect, but there appears to be no obvious reason why not.
Screenshots 8-10 - shows that manual CP detection worked in every case.