Synclavier V does sample drag and drop. The problems I can already foresee with your set are first, that you'll have to have it open to a partial page rather than the main interface; second, that you may need to adjust the detected key of the sample; and third, that if you're using multisamples, configuring key ranges for each partial in Synclavier V is a right pain in the arse.
EDIT: CMI V also does drag and drop, but it's got the same 3 problems: you have to have the screen open to drop a sample on one of the 10 slots, key detection sucks, and you'll have to fiddle with the key range editor if you want multisamples.