1. No, but there's a harder way. You can retime it yourself by grabbing keyframes in the Animation Pallette and moving them to the desired frame. By colapsing the trees, its easy to select all the characters/props/cameras/etc at once, but you have to change each keyframe one-by-one.

2. Yes...sorta...one character at a time. Save your animation as a pose, start a new scene or open an existing one with the same character. Jog your scrubber on your Animation Controller to the desired frame and load your pose. An animated pose will "write over" the proceeding frames for as many frames exist in the pose.

Confused Yet? Hope this helps.