QTR-Quadtone RIP

QTR for Windows has a lot of nice features.  I like the auto 
partitioning of gray inks.  I'm using a MIS UT7 inkset on my 2200.  

I created a lovely neutral profile using 5 of the 7 inks in the set.  I 
wanted to use that as a starting point to create a sepia profile.  But 
I couldn't add a curve shape that I wanted.  It seems difficult or 
impossible to do with QTR.  Going to PS, creating a curve, and 
importing it into QTR seems a difficult and laborious process.  

Does anyone else see the ability to add a curve and edit it freely as 
desireable?  It would be very nice to have the ability to adjust a 
curve on screen, without plugging in dozens of points.

I may well be missing something here, so if anyone has insights or 
solutions, I'd love to know how to do this.  

Thanks,

Lou