I don't quite understand the difference between removing, overwriting or masking the GPS info, but I don't have to. If masking hides the location from others I think masking is just as good as remove or overwrite.
,-))
The point is I think PM should offer a way to hide the GPS location data in some cases (especially for save and uploads) as the photographer not necessarily wants to share it with everyone while he/she might want to keep it for themselves.
I would also add it to the remove metadata panel even if it is not practically a remove but a masking - unless it is recoverable somehow. (Maybe there could be an asterisk and some explanation or link to a help page explaining the difference if the difference in terms can be important for the user.)