Aphrodite I'm not really talking about transparency. It seems it's more C2 making an assumption that black should not be considered as part of the collision area of the sprite for touch events.
For point 1 mentioned above lets say I have the following sprite animation.
The collision area of each frame is automatically set to the planet by C2 for each frame. So it gets smaller the further along it is in the animation. This means if I tell it play once when the mouse is over it and to reset when not. Then only just touch the side of the planet, the collision area gets smaller and so the mouse is no longer in it. So it will keep animating and resetting in a loop. Whereas if I manually change the collision area to every frame so it takes up the whole sprite it solves the problem. However, this is a pain if you are using lots of animations with black backgrounds. So I would like to really turn it off, rather than assuming black is not wanted in the collision area.