Does anyone know if its possible to increase the 157 meg memory use for editor ?. It's jsut my dungeon is growing, an now that I am itemizing it, it uses up mem fast.!! I am at 97% an still got 1/3 of the place to itemize. I dont know what happens at 100% but I am hoping it doesnt stop you doing any more.

Correct, it does not stop you. If you look around, some of the vanilla cells around Tamriel are over 200mb.
If things get too crazy, you should consider adding room bounds (http://www.creationkit.com/Room_Bounds_and_Portal_Basics)