I just explained the problem in the installation forum in the Users directory thread, but I think it might be good to spin it off like this.
Goal:
Have a HFS+ slice on the primary (only) HDD for the system. (/dev/disk0s1)
Use the rest of the drive as a zpool (and mount it as /Users). (/dev/disk0s2)
Question:
Will Zevo cut it? How should I go about it? Apparently I'll need to create the slice FIRST, and then specify the slice as the device for creating the pool. What do I create the slice with? How do I create the pool?