I don't really understand your first question (can you show an example) but there is a FLIP button in the window settings or info box that will flip the window inside/outside. That might do what you want.
As for the brick surround, if your window object does not have this option built in then you must use another object if you have one or create the corbels with small walls and columns.
Or you can create it fom a slab in the floor plan and cut a hole in it the size of your window.
Then save this as an object that you can place around the window.
There are many discussions here in the forums about this and a tutorial on the Graphisoft web site about "Building Objects Creation" that might help.
http://www.graphisoft.com/education/training_guides/#GDL
Barry.
One of the forum moderators.
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