marmistrz, I was just looking at the location sharing provided by Icecondor, the android app is maybe two dozen lines, if I had the foggiest idea how to write a patch I would and send it to you.
http://github.com/icecondor
http://icecondor.com/dashboard/developers
apparently location sharing was supposed to be part of of the N900 OVI Maps that was cut before release http://vimeo.com/14631858