I really prefer including male and female together. Especially since pinball is already male dominated. It's quite satisfying seeing women (my wife among them) qualifying for more skilled divisions and beating the guys in tournaments. I'd like to see more diversity, in general, in tournaments. Which is why I enjoy match-play so much. Everyone is competing against everyone else.
However, if enough women want an all female division and the PAPA crew wants to oblige, then I think they should do it. If we see more division categories, such as an all women's division, I just hope they encourage and motivate more participation by more people.