Right now we can only have a single game layer per map. This layer only has a limited amount of tiles and does not support per-tile-parameters. Due to the limited amount of tiles, mods might conflict with future vanilla tiles. The lack of per-tile-parameters (for example a teleporter number or speedup direction) requires custom layers in many mods. This leads to a lot of additional code, incompatibilities and makes it difficult to upgrade code and maps to new Teeworlds versions.
One approa...