e.g. tga or some sort of commonly readable uncompressed format so edits to some things can be done easier in external tools then reimported into 3DNes since the editor for patterns as is not terrible but the inability to delete a large swathe of bigger bits of pattern work without going in and using the pen/fill on tiny areas that have a lot of seperated pixels is kind of tedious where it's needed.

plus i figure that i'd be harder to add a select tool into the existing editor than to add the possibility of trying to get the patterns into an external image file, edit them with existing software (paint.net/photoshop) and re-import them.