OK I did some reaserch and found out that there is a new firmware to my LG (UL02) but I am not sure if upgradeing it will solve my problem as in fixed problems they mention compatibility with Vista and some other minor fixes but among them I could not find “solved 2x writing speed”
Reading few posts on this forum I have found a topic by ala42 “MediaCodeSpeedEdit support for LG DVD-writers”. Among key features of this program I found point number 5 “Reducing DVD write speed”.
Does that mean I can force my DVD-RW to write at 2x speed ?? Will NERO and other burning programs see that speed.
Or is there another way for my computer to see “2x speed”, since what I understand MCSE program lets you force speeds not supported by DVD recorder but LG GSA H12N, can clearly write at such speed as found at its description on various sites :
http://www.eukasa.pl/pc-i-pda/sklep/300343/lg/lg-gsa-h12n-rbb-/
I am writing this since playing with that program seems to me a bit dangerous and I dont whant to damage my brand new writer.
Thank in advance for any help you can provide me. 
Michal