I have updated the wiki :
http://enigma-dev.org/docs/Wiki/Room_Editor and added a paragraph about the the tile's layers. It was important to add this paragraph, as the selection tool is linked to tile layers : when you copy a tiles selection, it will copy by default only tiles of the selected layer, except if the option 'Edit other layers' is checked.
Now i have finished to work on LateralGM, and you will not hear me anymore for a while on the rooms editor !
