I did not even read 1/4 of the text but still manage to understand the thing
to many text for nothing
ps i don't see why you would play a game and do something esle in the same time, and two it not like you can do it without a massive training
Try to play minecraft on a dance board and cooking at the same time, and even worst here because it's a MMO so it probably do have a PvP that would be playing dark soul and doing something esle at the same time
And for the height i don't the the probleme because you already have another, having your senses duplicated in the first place, and tuching maybe in game you are walking in a plane but IRL you do have a wall in front so now you brain need to control 2 bodys ect ect ect ect ect ect ect ect
it don't make sense why not going with the play when you sleep or thing like that