Hi to all. I just commit the updated extension to trunk. 0.91/0.48 users can get it from here: https://inkscape.org/en/gallery/item/1358/

Improvements: Cleanup and better script for he helper text, thanks to Maren. Cleanup of layer names to easy use it. A transparency checkboard show in the pattern preview to notice about transparency in the pattern. Non unifrorm patterns not deform the default inkscape based pattern. All elements not necesary for make the patter are blocked, so is more easy work on it.

All the best, Jabier.