QTR-Quadtone RIP

I am a bit confused on the creation and use of ICC profiles for 
printing and proofing with QTR.  I am on a Windows machine.

If I understand it correctly, QTR uses the raw numbers in a grayscale 
file for printing, and any profile tag is ignored.  The raw numbers 
work with the chosen profile in QTR to determine ink loads.

Let's say I have a QTR warm profile that has a good Dmax, 
linearization and tone.  I want to make a profile for soft proofing 
in Photoshop, and a profile for printing, so that the soft proof 
jives with the data QTR sends to the print so the two match.  

1.  Do I create an RGB profile or a grayscale profile with QTR-Create-
ICC.exe, or do I need both?

2.  When editing the file in Photoshop, do I first convert from my 
normal working space to the grayscale profile that mimics my warm 
profile above?  I read that I use perceptual with BPC.  So, will this 
remap the numbers so I have the correct tonal scale when printing 
with my warm profile?

3.  Do I soft proof in PS using the RGB version of the profile, so I 
can see not only tonality, but also the color of the profile, in this 
case warm tones? What about 'paper gray'?  Do people use that for low 
Dmax papers and not use it for higher Dmax papers?

4.  And will this process work with any RIP, driver, or process?

If I have this wrong, I sure would appreciate some help in sorting it 
out so it is very clear.  I want my screen to match my prints.  I 
understand all this in a fully color managed workflow (eg, when 
printing color with the Epson driver), but I am a little fuzzy when 
it comes to QTR.

Thanks for your help,

Lou Dina