The OP built a free, GPL Blender add-on that lets you edit motion paths directly in the 3D View instead of going back to the Graph Editor.
Editing: Drag keys on the path and reshape it with Bézier handles. Alt+click switches between corner and smooth, X/Y/Z keys constrain movement, and Ctrl snaps.
Under the hood: It edits your F-Curves directly, with no hidden curves or constraints, so Undo and the Graph Editor work as usual.
Status: It's a prototype that only handles Object Location and needs Blender 5.2 or newer.
Feedback wanted: The OP is asking animators whether it feels natural and whether anything is broken, especially on Linux.
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TL;DR of the post, generated automatically.
The OP built a free, GPL Blender add-on that lets you edit motion paths directly in the 3D View instead of going back to the Graph Editor.