Re: #7
In my previous apartment, my most comfortable seating was also off to the side a bit in what could hardly be described as a sweet spot. I never got around to it (and have now moved into a much better situation: most comfy seating in sweet spot and room for my speakers to get away from the walls), but I'd thought about making one of the profiles specific to that less than ideal seating spot. On that profile, you could just place the mic at that location in the room. If you'd be moving around in the room, do multiple mic measurements (from spots in areas you'd likely find yourself) and get the best possible room correction from those measurements.
In my previous apartment, my most comfortable seating was also off to the side a bit in what could hardly be described as a sweet spot. I never got around to it (and have now moved into a much better situation: most comfy seating in sweet spot and room for my speakers to get away from the walls), but I'd thought about making one of the profiles specific to that less than ideal seating spot. On that profile, you could just place the mic at that location in the room. If you'd be moving around in the room, do multiple mic measurements (from spots in areas you'd likely find yourself) and get the best possible room correction from those measurements.