No there isn't at the moment. The tilemap chunking system is essential for larger tile maps. If your tilemap isn't THAT big, then perhaps you could try increasing the chunk sizes. Its pretty much just a UI limit in tk2dTileMapEditor.cs
partitionSizeX = Mathf.Clamp(EditorGUILayout.IntField("PartitionSizeX", partitionSizeX), 4, 32);
Alternatively you modify your raycasts to cope with it. This is a fundamental issue with Physx - you can reproduce it with 2 boxes side by side. Or you could modify the physics mesh generation code to build it all into one large mesh.