Fog, if I understand you correctly and if my memory serves you can actually use one and the same sfz file on all the pads. I'm pretty sure I've moved whole sfz drumsets by dragging and dropping the common sfz-file on the pads. They're "smart enough" to know what part is "theirs" as they're "hardwired" to specific midi keys. Then you just save it as a kit. It's not as easy as it could have been, but a lot better than separate sfz's.