but I actually meant rotating walls and floors too.

I really like this idea of rotating walls(esp. as a group). While you can move objects as a group, you can't (yet) rotate them.

Re interior Exterior walls...
I thought it would be nice to switch between the 2 with a single click, instead of changing the default in the dialogue box.

You know it's quite simple to make "interior walls" at present: Create a standard wall, double-click on it and change it's width. Pressing CTL and dragging the wall creates a copy of this wall. You can then move an endpoint to "rotate" in increments of 15 degrees.(I haven't yet found out how to rotate in arbitrary angles)

Not to say that I don't appreciate the idea of "Wall Styles"

Just my 2c. [:p]