At first, when I thought about this months ago, I believed it wouldn't be needed since the controls are very basic and you'd know when the player is going left and right or dashing. But, I guess now that you mentioned how replays tend to distort the rigid gameplay of CtB, perhaps it would be helpful. On the other hand, you'd be looking more toward how the catcher is weaving through the fruits, and maybe too busy doing that to see what controls the player pressed and how often? I mean, standard benefits from this because it gets players to know what buttons the player uses to click the circles (OMG he's a singletap lord!)
I could throw in my support, sure. There's nothing too much against it not being added, but then again there's not much forward to it being added too (However, it's a fairly simple feature to add, though)