I think this feature is something that one day could be integrated into SFML and since there's no ticket on the issue tracker, I suggest you go ahead and create one.
Keep in mind however, that there's a lot of other things there, some dating back years. Plus there has to be done some research first, e.g. whether such a feature is even doable on all supported OS. Thus you shouldn't expect this to get implemented in the near future. However if you have concrete ideas on how this could be implemented properly, we could start a discussion here and if you or someone else provides the full implementation, it probably would get into SFML a lot quicker.
