OK, I don't wish to sound like a troll... BUT,
your wild dreams of what you would like the software to be are so far from what it actually is that I think you're doing DAZ a disservice by raising peoples expectations way too high.

DAZ|Studio is, for the most part, written in an interpreted scripting language (QtScript) very similar to Java, and the interface is constructed from Qt Widgets. The render engine is bought in too. Now that's a very sensible way to go for a relatively small company with limited resources, especially in a marketplace where Mac users represent a large enough minority to be considered. Qt runs on W32, Mac and Linux and has the OpenGL widgets that make those nice render previews possible. Qt is a dream for developers who need to port to several platforms, what it isn't, and will never be, is as fast as natively compiled code. So, frankly, whether DAZ recompile their C++ code to 64 bit is pretty irrelevant unless Qt's developer's (the rather amusingly named Trolltech) and 3Delight follow suit.

D|S seems to me to be an excellent attempt at what DAZ (in the person of Bryan Brandenburg) have said it's meant to be, judge it by that and have fun with it, stop trying to hype it up into something it can't be.

John