I'm just finding out things myself BTW so for more experienced people: please step in.

In the meantime:

 - although looking through the Main cam gives the suggestion that I can change the Y-position of a Walk Path control point, the Front etc cams reveal that I cannot. So a Walk Path remains at the ground level (and I have to alter Y-moves otherwise)

 - WD does generate a series of animation keys, one for each frame (!) with rotate keys only, except for Hip which has XYZ translate keys as well, unless "walk in place" is checked.

 - I would set WD to make an animation on a separate layer indeed. Then I would run Resample Key Frames to lose the majority of the intermediate keys, leaving me far less keys to manipulate.

 - In order to make the animation flexible in Y, I will have add keys in the Base Layer AND set the Walk layer to ADD-mode, instead of Replace which overrides.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though