My problem with IMAX scenes is that the AR shift wouldn’t have to happen if they just did the whole thing in IMAX. Either use IMAX or don’t use IMAX.
It would be a wonderful thing, but the cameras are too noisy and the film stock is so expensive. 70 minutes in the Dark Knight Rises is probably the nearest to a full film there’ll be. 5 minutes in Star Wars was kinda pointless - although it did mean they had show the film on celluloid in a handful of places!