I wrote to grman LG support recently about Booktype Setting capability in their latest DVD Multiformat writer 4120B. Today, I got a response from them in german language, here is a translation of what it says:
“Regarding your inquiry I can inform you that there will be a firmware update supporting “Booktype setting”. An exact release date is not known yet.”
I think this is a very positive signal from LG towards their customers, and I am really happy that they have become aware of that problem.