This panel allows editing of the coordinates of the 'first selected keyframe' on the Active F-Curve. That is, if you've got keyframes A (5), B (7), and C (12), and B & C are both selected, then the 'active keyframe' will be B.
While I still think it's more efficient to use the cursor for batch-setting a bunch of keyframes, there are currently problems using that for sub-frame placement on the x-axis.
Notes:
- There is none of the averaging crap from before, where no accurate value could ever be set.
- Take care when setting the values of the handles, since getting correct F-Curve recalc flushing working via the RNA stuff is VERY TRICKY, and has been left out for now to get something workable. I recommend setting the values numerically, then grabbing these keyframes and immediately cancelling, to get these updates done.
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