Add verbs that affect selection by adding or removing a tile to it. For example, adding the tile 42 to the selection would add all the 42 tiles to the selection. Removing the tile 42 of the selection would unselected all the tiles 42. Additionnaly, an "exclusive selection" following the same approach would be usefull ; e.g. remove all the tiles of the selection except the tiles with the ID 42.