No unfortunately it can't reverse animations. This is a feature I've been pushing for (among others). Anyway you can cut an animation length down so you don't have to use an outside source. Try playing with a few of the options for animations. If you still can't get it how you want it I'd look into blender or 3ds max.
Im not sure what you mean by this really.
@KingRadical: Go
That might work outside of the CE but actor manipulation like that is hard to do with the CE though it may not be impossible.
@RuneKatashima: Go
No unfortunately it can't reverse animations. This is a feature I've been pushing for (among others). Anyway you can cut an animation length down so you don't have to use an outside source. Try playing with a few of the options for animations. If you still can't get it how you want it I'd look into blender or 3ds max.