I had a SDS system on my turbocharged Acura Legend that I'll be putting on my Z in the near future. When I had it running on the Legend, everything was adjustable. I have to ask if you have the controller?
It's really easy to use. To adjust your AFR, you would go into the RPM fuel section on the controller, reference your dyno AFR map and use the -1 button to subtract fuel at any given RPM until you are reading AFR's where you want them. The manifold pressure settings are pre-programmed from the factory, IIRC, but are also adjustable. These would affect your cruise vs. WOT numbers, so them saying it is one way or the other is crap.
You should have full tuneability for your fuel maps. Like stated above, the ignition contol is nice but not mandatory.