For one, it would be nice if for buttons they would add it so they can only be clicked if their source image has opacity where they are clicking, as in that location is part of the image that makes the button and has alpha greater than 0. This would do a lot for circular buttons and such. I also think it would be nice if for widgets they add a type of progress bar that fills clockwise or counter clockwise, like a circle which a lot of games have including Unity.