Thank you so much for your reply. I am currently trying to familiarize myself with everything so I can create a template with my preferred defaults. These are just the things that were tripping me up so far.
I've attached a screen grab of my menu for Edit>Delete Objects. I don't see an option to delete only Auto Exterior Dimensions - only Dimensions, Automatic. I assume this would include my interior dimensions as well which I don't think I'd want turned off?
Okay, so I need to change how I take my measurements then to make this a little easier on myself I suppose, ha. The question you were confused on is also clarified by the fact that window size does not include trim. (I had 0" exterior casing and 3" interior casing in my default. So, under the assumption that the dimension included trim, I thought that the default dimension was being placed on the exterior of the room. Hope that makes sense, not that it matters though... moot point now.)
Again, thanks very much for clarifying and making this switch a little easier on me!