Pipette function for walls, ground, etc.

You can copy Items but if you generate a room random you can't copy the wall theme. Or I didn't found the option. It would be nice to have the pipette option like in paint. Choosing (in the wall menu) an exisiting wall and get it locked for placing the next wall. Especially usefull if there comes more options for wall themes and stuff or in my case, doesn't know all the walls by name.
Same goes for ground themes and stuff, you can't copy directly