dopesheetFlow
Is it heavy?
No heavy dependencies; it reads your Grease Pencil directly.
Can I edit timing from it?
Yes: trim or ripple move, double-click to jump to a key and layer, per-layer isolation, key types, and 3D-view scrubbing.
What does it add?
A real drawing thumbnail on every Grease Pencil key, organised as Scene / Summary / groups / layers, aligned to the frames.
Where does it show up?
Via its dedicated button in the Dope Sheet header.
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