This PDF-Exporter provides many features over the out-of-the-box Polarion PDF Exporter.

Export only specific link roles in the Work Item tracker
Optionally hide attributes in the Work Item table if they have no values                                
Support SVG images
Advanced LiveDoc comments rendering
Select any page orientation
Customize the CSS styles
Support PDF version 1.7 and with it the PDF variant a-2b

The YouTube video PDF Exporter from SBB - Live Demo by GARANTIS IT Solutions explains the features of this extension point by point.