Cinemachine Track Curve Editor missing curve presets and copy/paste

I've got a camera blend that used to be handled by just activating a new VCam and using the brain's blend settings. I want to transfer that blend to a Timeline.

The current blend uses an animation curve, so I want to copy the same animation curve to the Timeline's blend. Usually when I want to transfer animation curves from one object to another, there's two ways to do it:

- newish: Right-click one curve, copy, right click another, paste:


- older: use the AnimationCurve preset feature in order to temporarily store the old curve as a an preset, and then apply the preset to the new curve:


But when I'm trying to edit the curves for a blend in on a CinemachineTrack, nether feature are available. The right click doesn't show a copy/paste menu, and the curve editor doesn't have any of the custom presets:



Is this an oversight, or is there a fundamental reason why these features are missing from the curves in Timeline? It seems strange that the features have seemingly been reimplemented in an inferior form.