There's no real need to change it. I believe Manehatten is specifically chosen because it is a location that is considered to be 'darker' than, for example, Ponyville. Therefore, a bullying colt is more suited to that location.
Also, by setting the scene for the user, they must use what tools they are given to construct their roleplay segment with, rather than being able to conjure anything they wish. As an example of roleplaying that must be judged by moderator/admins, it allows them to see how well a user can adapt and make the scene their own.
Just thought I'd answer this thoroughly :)