Hi, yes dt does not support multiframe images, it loads only first frame. I didn’t try pixelShift2DNG. Rawtherapee can process pixelshift images. dcrawps should support multiframe images, becasue it is pretty much the same program to load raws as used in rawtherapee, but i dhon’t know if there is any user friendly way to do it.
Anyway i started work on support for darktable (discussed here Multiframe DNG support for darktable) here Support for multiframe DNGs by maruncz · Pull Request #350 · darktable-org/rawspeed · GitHub and here GitHub - maruncz/darktable at multiframe
But i cannot promise anything