looping motion tween cs5

[LiftYourSkinnyFists]

I'm trying to learn the new tweening system for cs4/cs5. I created a character and I did a bunch of animations for him with classic tweens, but I decided to try out the new motion tweening, and I'm finding it very hard to loop animations with the new system. Before, with the classic tweens, you would usually just copy and paste the first frame of the animation to the last frame to make a loop. But with the new tweening I can't seem to copy and paste the first frame. I find it very tedious trying to put my objects back to the way they were in the first frame. Is there any way I can make the last frame like the first without having to manually move it to the way it was? I hope i'm making sense here, I would really like to learn how to use this properly. If anyone could help me out i'd appreciate it.