What tends to happen is if you follow what the tutorial says and select a bunch of statics and click the create room button, you get a slightly oddly shaped roombound. Hit 2 to turn off the scaling and move it around a bit in all axes and it should snap to the global grid.
Of course then sometimes your snap value will be lower than the snap value for scaling, but hey...
I will try that, thank you.
What it actually says is
Ctrl+click to select wall pieces from each side of the room. Is that what you're doing?
Yes, I explained myself wrong in the OP.