SCT Xcalibrator 2 questions

There are optional settings for:
Spark 0-2000, or 2000-4000, or 4000-8000. What does this mean? What do you folks do? I notice after the highest spark setting option it says, "WOT Air/Fuel". I don't know what they're asking?

I'll find out here real quick if our gas around here, which only goes to 92 octane, will support a 93 setting.

I don't know why Doug at Bamachips thread was closed? Sounds suspicious for sponsor annoyance at his post?
Anyway, I don't see "Read DTC menu" on my device, but I've already used it. Is my inability to find my device code because I've already used it, or is there a menu pathway to find it?
Thanks.

I see that SCT has a site and forum. The overall impression is that their instructions are woefully inadequate. They made available a pdf file that answers some questions, but shows they could really use a good technical writer. I have to write SOPs (standard operating procedures) on a regular basis, so I know how things need to be spelled out step by step.
http://www.sctflash.com/index.php
I didn't get knocking last night with Hawaii's 92 octane fuel with a 93 octane setting.
I don't see a main menu when I hook up the SCT, like I did when I first used it.
The SCT site has a write-up on hooking your laptop to the device while it is hooked up to your car. I'm not sure the indication for using it? I would hate to booger up the car guessing at stuff.

http://www.sctflash.com/forum/showthread.php?t=3177

This is probably their most important thread.