I don't believe its possible currently, could we have an option to toggle if a sprite animation should loop or not? Would be useful for talking/blinking animations. Ex: You can have an animation of a mouth opening which stays open (on the last frame) with prolonged audio, instead of constantly flapping as it would now.  

TY for this program :)

Now that I think about it more I guess the animation would also have to be inactive in mouth/eye closed states, so it always starts at frame 1.