I realize this post is two and a half years old, but I have the exact same problem as Pete Oak and I have tried figuring it out futilely for too long. Any help would be immensely appreciated. I haven't found any useful information about this on google despite searching a lot.
I am trying to edit the speed graph of the time remapping function for an animation of mine, so that the speed increases in a linear fashion. The way the curves of the speed graph move when I adjust the keyframes is incredibly counter-intuitive and frustrating, as the curve (if it even can be considered as such, as it is just a straight line) I am trying to achieve seems to me like a very banal one.
Out of resignation I have even constructed a 24 frame long linear speed increase manually, by calculating the position of each keyframe and moving each into the correct position. Now I need the same curve for a 7 second long segment - There must be an easier way of doing this, mustn't there?
If anyone has any ideas or advice on this I would be very grateful indeed.