Thanks rmaine for your answer ! I did not really read the wiki . I was persuaded that kerbal experience depended on each competence domains. And for pilots with a MechJeb in a vessel, the MechJeb was the pilot so no values for kerbal inside, no stars to earn … That I desperate to check during the recovering of a crew.
Nothing to do…
Everything for experience is in this article , depending only (that I experimented) in situation to be in orbit, plant flags etc. And not necessary to wait for a recovering, the labo (Mobile processing lab) can do the job…
I am not against the MechJeb , even if I think that to use some engines (like the vector) it is quite impossible to pilot without it in some configurations(…). But with the new rules to perform construction in EVA, the MechJeb part is not removable and that is a hard thing to manage is you want recycle every things in space.
But maybe it also is in development.