Much wanted feature, to have paths with children having fixed distance offsets from each other, for example to animate a train with wagons. Solved it with Path option (Editing buttons curve) "PathDist Offs" which interprets time-offsets of children as blender-unit offsets. The entire animation system still works, but offsets are calculated based on distance, even with a CurvePath without motion (speed curve horizontal). http://download.blender.org/demo/test/pathdist.blend Thanks to Bassam for kicking my ass!