Add a paint bucket tool. As a mobile player,it is very difficult to paint things like walls all at once (Unlike PC players who can have shortcuts and can paint the same color faster). The paint bucket tool would rest in the bar like the other tools (resize,transform,etc) to make it easier to turn on and off. Once the player clicks on it,it will take the color last used and paint every wall or any other item you click on that exact color without you having to click on each individual wall then click the previous wall you colored.