(Copied from original User Voice forum)
"This is an absurdly missing feature. The Animation Source + Time Editor system is super cool, but it is severely lacking in options to tweak the animation keys on the fly (unless I'm missing something obvious). The closest I have been able to get to this feature is to Apply the animation source to the scene, make my tweaks, then use the "Add Animation To Time Editor" to create a brand new source... but even if I name it the same as the source, it is created as a duplicate?! This means that any clips that use that current source are not updated and I have to go through and manually delete the old clips then add the new one in their place. The only other option currently is to select the animation source in the outliner, and then go into the graph editor and move the literal curves. This is an impossible workflow for any animation with more than six keyed attributes."
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