Abdallah,
I wish I had better news for you my friend but after just reading your post and confirming with Steve Deming at Yamaha, I've been told that you cannot make drum kits out of samples and this would also answer question number 2 that you can't use sampled drum sets in the styles since you can't make drum sets in the first place. This is very disappointing information for all the middle eastern musicians who need specific ethnic sounds in their drum sets. If I find out anything else at NAMM next month I will let you know.
George Kaye
Kaye's Music Scene
Reseda, California