Now, batch stitching photoes is available on PW 8 professional Edition. You can batch process your photoes by PW8 Batch Processing.
It can batch stitch up to 300 groups of images to panorama
Batch publish panoramas to multiple players: Flash, QuickTime HTML5
Batch convert cubic panoramas to spherical panorama
s and vice versa
For edition comparison, please refers to Panoweaver 8