There is no need for a user group permission.
VERY, VERY important would be a system wide admin switch (or even a fixed setting!) to completely erase all geo EXIF location data when uploading any image to XenForo (be it XFMG or regular attachments). This is a huge security problem, since most people are not even aware that they publish their home address when uploading a picture!
All other EXIF data can and should stay, because it can be used after uploading..