QTR-Quadtone RIP

I'm creating some curves from scratch (using UT2 on a 1290s) 
for Epson Glossy and Semigloss (at 2880dpi) and was wondering if the 
Media/Type selection I make in QTR will make any difference; should I 
choose the correct Media Type for the paper I'm using or because I'm 
doing it from scratch should I just leave it at default (matte paper) 
and be done with it? By the same token I suppose I could just select 
Other as the paper type.

Basically what I'm trying to establish in my own mind is; what is QTR 
doing when making different paper selections, is it an ink limitation 
device?

regards, Jamie Creed.

P.S. actually Semigloss doesn't show up as an option for the 1290