I know this isnt really a feature but I would like to see a road map for SFML. I read that your very busy and you only work on this in your free time so you dont exactly plan it out but an idea of what your going to do would be nice.
Even if it was simply a TODO list that would be cool. Im sure you have an idea in your head of what things your gonna work on next, even if its not for a while, you could just add them to the list!
Not trying to demand anything, im just REALLY impressed by this lib and would just like to see what great features to expect and what areas your working on!