There's no easy way to time-reverse keyframes, correct? I have a character that I'm moving along Position X by a certain increment. I've manually entered them moving from Position X "-1060" to Postion X "0" incrementally by 10. I want them now to do the reverse... Postion X "0" to Position X "-1060".
Are you trying to do a smooth movement or jerky? 1060 to 0 in units of 10 is a lot of data points! Is there a reason you did not just record the 0 and 1060 values and use a linear blend between them? Understanding what you are trying to achive can help.
For example, you can layer recordings to achieve what you are describing, but that would be 106 layered track recordings which would just be stupid painful - worse than any alternative.
At least in terms of a quick command like in After Effects, there isn't a way to time-reverse keyframes in Character. Although you can time-stretch keyframes, it currently blocks you from flipping in time.