Because this question seems mysterious for all people around, I try this communication channel: does anyone know anything about a description of gravitino vevs in N=1 supergravity? Is there a counterpart of the Veneziano-Yankielowicz work with gauginos replaced by gravitinos? Alternatively, can you summarize how you would modify the paper to do it for gravitinos, or why it's not an interesting question?
Update: thanks to Jean-Paul for his immediate reaction. He has pointed out this article to me. Please only click after you pay money to Elsevier. ;-)