It would need to place all the stashes on the map on to the admins map with permissions, is that possible?

yeah would be alot better then the /sg command wich is working only in a radius and not on the (g) map 

Change

return marker.OwnerID == target.userID ? (object) true : false;

to

return marker.OwnerID == target.userID || target.IsAdmin ? (object) true : false;