I was in the mood for stories with those two series but, when I looked around (Ranmafics, FF.net, Ladycosmos and Rakhal), I was disappointed to not find much of anything. There's probably something in the bowels of FF.net, that isn't listed under crossovers, but I'm not willing to dig through all of that at the moment.
There's one story that I didn't see at the places where I looked, that I wouldn't mind reading again. Perhaps two, though they might be one and the same. In one, Ranma has taken Nene's role in the story, and I think a part illustrates the ability to hack. (The story might have been rather short, in part due to being unfinished.) In the other, I think Ranma wakes up and finds himself in a room or cell where he's being confined (possibly by the Knight Sabers), and he forces his way out.