Yamaha DTXpress/DTXplorer/DTXtreme

.....................I am thinking of buying an extra cymbal pad and 
splitting the rim sound off to that pad.  Has anyone tried doing that?

Nicholas, I've done that. I use the dual pad to the right, and have 
the edge programmed as a crash and the pad as a ride. However, I 
didn't like the feel of the pad for a ride, plus it wasn't placed in 
a comfortable position. I 'Y-ed' a TP80s pad to it and placed it on 
lower on the right. I use the pad to ride on and it's better 
positioned and feels more comfortable. I can crash the rim and choke 
it as well.