And to add to the above : there is nothing wrong with unwrapping a cube as 6 islands. That's part and parcel of the whole hard edge approach. To our dear friend Jake Gyllenhaal : what about trying things out ?
I use Max 6 because the tools for my current expansion pack project are written for Max 6 and the tool programmers have moved onto support other projects.
The answer for your question is on this video. Starts at 6:00 min. [ame="http://www.youtube.com/watch?v=7HjnXfZfD60"]ZBrush Tutorial (Architectural Techniques) - part 6 - YouTube[/ame]