If memory serves me, you used to be able to rewind replay data. I believe you also could fast forward and rewind at up to 8 or 16x, but the max is 4x now.

It sucks having to wait in 4x mode for awhile, then slow down and realize you just missed the really awesome thing that happened in your saved replay, but not be able to rewind and check it out.

Are there any mods, or is there a way to "hack" this into the game through config files?