I've just had a look and yes it should be possible to convert them (conversion is necessary atm rather than simple parsing as the abook headers don't like being used in a C++ program so for vCards I write them to a temp file and open that using the correct mime handler app - i.e. contacts).

With that said I don't have the time at the moment (off to the US this weekend) so if anyone fancies extending the functionality of the qrcode plugin please send in your patches.

I also note that MECARD is but one of a myriad barcode payloads from docomo. It would also be nice to parse and use more of those.