Oh right!
Control Rig is a great way to edit animations as well. I think this could be a better way than extracting curve data directly. In sequencer you can bake to FK controlrig which can be generated automatically for you, and while editing with only FK controls can be daunting, It almost the same as getting your curve data from animation.
If you or someone else can do rigging, you may create rigs that will help to animate with ease. It may be not that powerful as in DCC (eg, still trying to imitate follicle system as in Maya), but it’s going to cover most of the needs. And in some ways it’s even better.
Cool features like baking animation both ways between controls and bones, linked animSequences and python support, actually making UE quite powerful for editing bone animations.
ControlRig slipped my mind initially, but I do recommend exploring it further.