Hi! It would be very useful to be able to modify the animation speed also with negative values, to reverse the animations. For example, an animation speed of -1 could play an animation loop backwards at normal speed. For non loops, the user should adjust the current frame to the last frame of the animation.
You can already do it by subtracting the current animation by 1 and setting a timer for how frequent it subtracts a frame and that would determine its animation speed