I suggest to implement the following feature:
Currently implementation of SVG converts it into a bitmap before exporting to PDF.
Using bitmaps has the following drawbacks:
a) the images are no longer vectorial, so quality is poor
b) the document size gets bigger, especially for big pictures
c) the text inside the SVG document is not longer searchable in the PDF
PDF format is supporting internally vector graphics, as it is somehow an evolution of Postcript, so it is technically possible.
Furthermore, there is an open source project: Inkscape that implements the components needed fo this purpose (SVG to PDF vector export).