The option would have to be optional as the name suggests though but it is a good idea!
Some people I have been messaged by for example wish to get... various pictures... from me or as one person said 'I go your home now'. I am just lucky that I have the blacklist option!
I can imagine that any female players not willing to display a picture would be walking into the same situation as I am in now if they were able to display their gender. Just a thought but it can be a little annoying
I am now even considering removing my picture due to some of the 'stalker' like messages I am getting! They are just creepy and perverted.
But yeh it is a good idea and should be something appearing in the future.