Use Slot 1 and Slot 2 memory as seperate drives
Remember those old Apple 1 computers, they had 2 floppy disk drives, and in some cases a program would use info from one disk and switch to the other. I wonder if a flash cart set would ever allow 2 micro sd cards to be treated like two separate drives, one in slot 1, the other in slot 2, then move and use files in between the two places.
That might be useful for high yield programs like fractal generators, or dealing with music and video libraries.
In general my view tends to take the DS, say what makes it different from a computer, then say, what can we do to lessen that difference.