What happened to it in rmxp? I can't find it anywhere.
doesn't exist, you have to make the dungeons yourself.
Wachunga made a script which made a random maze, but it was only a path way, no open areas. But then again, the one in 2k3 wasn't so great to begin with.
Here, I will find the one by Wachunga for you:
http://www.geocities.com/geowil11/randmapgen.html
why'd you go and do that, now people will be lazy again! ;D
If you want open spaces, you will have to set up a complex event system. If you want to learn how, PM me, but take warning, it takes alot of work.