Currently when you are prompted to generate the tile grid in a new map, you have the default set amount of tiles its going to generate (ie: 64 x 64)

I suggest that changing the system to use hammer units like this

and instead of generating a set amount, it populates that amount of hammer units with enough tiles to fit inside of it.

That would let us, the modders, be able to change the sizes of the actual tiles inside the tile set.

As an example the standard dota 2 tile grid is 16384 x 16384 units and the default size of a tile is 256 x 256. That gives us 64 x 64 tiles. Now lower the size of the tile to 128 x 128 and we now have 128 tiles in each direction to play around with and still only for the same size as a dota 2 map.