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Okay -- an update! I spoke with Jay, we were using it in 6ch mode, and to be honest, the software isn't able to take advantage of the 8 or 12 channel modes. I'd set them for 6 or 7 channel mode.
The DMX modes, per the manual, are:
6CH - 1 channel each for R / G / B / W / A / UV
7CH - Same as 6CH; adds master dimmer
8CH - Same as 7CH; adds strobing
12CH - Same as 8CH; adds colour macros, programs, program speed / sensitivity, and dimmer curves.
The strobing is all controlled by simply sending on/off signals, so the strobe channel isn't necessary, and the programs aren't used (everything is pre-programmed through the software) so those also aren't necessary either.