Hello, I believe that limiting the entrance level in maps such as map2 and the rest is a change that won't do any good to the server, I'll tell you why:
There are NPCs that can only be found in map2
Fishing spots
Veins,
The change that has to be done instead is turning off pvp to characters that are 10-15 levels or higher than lv35, or so on, on short people that are 10-15 levels higher than the highest level metin in the map.