Hi Armin, I can still reproduce the behavior described:
Open eg. http://openclipart.org/detail/172011/racing-helmet-by-gnokii-172011 in Firefox and drag the SVG file to the Gallery in AOO. On my system (Win7 Pro 64 Bit) the resulting Gallery entry is a BMP file.
Joost wrote somewhere in this thread that SVG dropped to the gallery is converted to bitmap formats. I checked this and it is not true. When using a SVG from the gallery and svaing the document, I checked the SVG embedded into the ODF format - it's exactly (byte by byte) the original SVG I was dropping to the gallery. Works as intended/expected.
Kind regards, Joost