i think you recently switched to Cubase right? You can make a drum map in SX that remaps the sounds in the DFH kit to other keys. Using this tool you can make a gm drum map. it takes a little work but at least you don't have to actually edit the instrument. makes things qutie a bit easier actually. it's been a while since i used this but check the manual. in the inspector there's a pulldown for a map. choose setup map and you'll see a grid where you can assign an incoming note and destination notes plus many other parameters. i'm sure it will work for your purposes.
Yea, I got Cubase SX3 installed here, but I haven't had the time to really get to know it, so I'm sticking with Cakewalk for now. I still think Toontracks dropped the ball on that one. I see on their site you can download an .art file update, but you have to register first, and in order to register, you have to send a little card via snail mail all the way to Sweden, wait for it to fly over there, and wait for them to process it. Could be weeks!
*pounds ground like Donkey Kong* *... you guys know who Donkey Kong is right?* ::