Hi Pilou,
re:
> The fact that extrude works for both in the same time only when on face is flipped...
It doesn't do that.
Flip can flip the direction of selected curves or a surface or entire joined surface.
It doesn't do anything on a face selection.
Extrude does work on this if one or both faces are selected, without any flipping.
However extruding a face selection also tries to do a boolean with the extrusion and that won't work very well if the object isn't a solid. You can turn off the boolean by setting the "Keep separate" option.
So select one or both faces, use "Set dir" and set "Keep separate", should work - no flipping needed.
- Michael
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