First many thanks for your plugin, nice work!
However, I got following questions:
1. After I insert full size image, I find the img alt="" is empty, can the system pick up photo title?
2. Same apply for pwg-category, pwg-gallery shortcode image, please add the alt text.
3. Can pwg-category add the thumbnail size parameter?
WP 3.5.1 + piwigo 2.5.1