The feature menu of the bottom timeline and the side history gets Copy (the selection, or the right-clicked feature) and Paste (at the marker). Ctrl+click in the bottom timeline toggles a feature in the selection (#1034).
The feature history can sit in a panel on the left, with folders that hold one unbroken run of features, drag and drop as one undo step, and a resizable divider. Timeline folders save under format 17.
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