Certain missions require that a center point of the map is defined and use this to randomly place or select locations from this point. This is especially the case with missions with dynamic content like for example Insurgency or Domination. But other scenarios with dynamic contenct may have its uses.
The advantage of this approach is that the scenario will always know where the center of the map is and can go on from there. However, this does require intervention of the mission editor on their part to reposition the center with every new map they wish to use for their dynamic missions.
If you take for example Dynamic Zombie Sandbox (DZS) for A2, this works on every map that has sufficient Locations. But this isn't the case on all the maps, for example Stratis doesn't have the Locations you would see in Chernarus, Takistan or Utes. How DZS does this is simply by having a script generate the objectives, place the players and populate the towns. And this can be done on every map just by simply renaming the island name of the pbo to a new island (for example: dzs.chernarus.pbo -> dzs.utes.pbo). I would like to do this with my dynamic missions so I have lots of re-playability without having to do tons of stuff over and over.
So next to my request to add lots of Locations in future maps. I would like to request a marker or a Location with the center of the map generated by the engine instead of requiring the mission editor/scripter to manually guestimate and place it.