I would like to copy a bunch of keyframes, and reverse them later on in the animation. However, when trying to reverse the keys in time by sclaing them in the dopesheet, I can't scale them so they become negative. Only down to zero in time.

So my question is, how do I reverse a bunch of keyframes at the same time. As I am able to do in Maya by just scaling them in the X axis of the graph beyond 0 (to -1 normally).

you can do this in channel editor
select bunch of keyframes
press y to enable scale handle
now you can scale to negative
you can also adjust pivot point for the scaling

tamte
you can do this in channel editor
select bunch of keyframes
press y to enable scale handle
now you can scale to negative
you can also adjust pivot point for the scaling

Thanks! Exactly what I was looking for. Couldn't find anything about it in the help for the channel editor. But that did the trick.