Suggestions

Distance scaling parameter. Basically add a parameter where if a mob spawns in a certain position in the world or distance from a coordinate, it'll spawn with a set difficulty scale. This primarily for multiplayer instances so new players that join late don't have to deal with a global higher difficulty and can progress at their own pace. For example, the further out you go from 0,0, the tougher the mobs are. This helps players of all skill levels and progression.

Solution

To implement this, it can the same way as to implement time based scaling in the config. level followed by x and z parameters that have to be met to have this difficulty. so 5: 1000, 1000, F. So, 5 is the difficulty, 1000 is the x value needed, the next 1000 is the z value needed, and F is a true or false dictating if both parameters have to be true to apply. This allows for mobs to spawn in a square radius instead of just in the corners. In reality this'll change the difficulty scale in certain areas, typically in square radiuses. If it is possible, a circular radius would be very good.