Digital BW, The Print

I have a few questions about the vm sets I hope someone out 
there can answer for me. 
First question, It seems that one would lose a portion in the density 
range by removing one the channels used for the blue-like 25% for a 
quad set. Is that true and if not how does it compare with a four or 
six channel set?

Second: From the earliest experience with quad tone inks I've noticed 
that the paper dominates the overall warmness/coolness of the print. 
Warm paper = warm print, neutral paper = neutral or much less warm 
print. Question is: Would a dyed paper (say blue, warm,or whatever) 
used with a full quad/hex tone inkset give optimum densities and 
control over the warmth?  

Third question is about the max warmth attainable. I've done zero 
work with sepia but what I have seen of "sepia" prints look much more 
orange/brown than the warmest B&W tone. How close do any of the B&W 
inks out there come to a "true" or traditional sepia and can anyone 
point out a standard which I can use as THE SEPIA cause I've "sepia" 
range from orange to bronze. Is anyone working on a solution that can 
sweep from sepia to selenium?


Thanks in advance 

Jeff