I know these maps don't really add anything new to the game, but I always wanted to explore them. They could easily be added from Maplesea's files, since they were in it (It is probably more complicated though, and if it is too much of a hassle disregard my suggestion). Also, some of the monsters are already in the summoning bags, so I don't know if it is easier to add them.
I'd rather have the developers focus their efforts on other highly requested issues like a revamped skill patch or fixes to the lag. However, I am interested in the Golden Temple grinding maps that require golden tickets to enter.