This link has some excellent reading material from several sources. http://www.roomeqwizard.com/index.html#reading

The actual use of REW to it's full potential is complicated and to be done right needs a lot of understanding of room acoustics and time and frequency response curves and how to set them up and read them. I would think that the "ideal" response would be perfectly flat but, since we don't live in an ideal world, every room is going to require a specific adjustment curve. All REW can do is tell you where your room response is lacking and give you some capability to alleviate it for your room. REW tries to set your room up for one listening position whereas most other room corrections allow multiple positions but trade off accuracy at the master position to give us some sort of weighted average response.

I would expect Outlaw to give us detailed guidance on how to go about making the adjustments on the EQ menu but not so much guidance on how to use REW as there are so many ways to use it the manual would have to be very large. For those users wishing to really tweak their systems the guidance in the REW program and website will need to be used.