wiedehopf;
Correct - Typo, 12R usually in use for departure.
Despite the fact that DXB is percieved to be in a 'flat environment', there are in fact many manmade obstacles in close proximity to the airport on the dep and arr tracks. For instance there is an Engine Out procedure 30R to avoid a tall building.
underfire;
The load people are infact the pilots. Loading control simply release a weight and cg. Some companies have dispatch pre calculate a MTOM based on forecasted conditions at STD, but not all. It is the commander who will be part of and responsible for the performance calculations used for the actual takeoff.
Go Arounds are usually runway occupied in DXB. Previous wake trail trial extended and new 3Nm separation applied. On the second approach the crew will be acutely aware of the previous issue and mitigate accordingly and effectively during the second approach.