Thanks for your reply.
I am very instresting in investing this passes, but I don’t know how to develop plugin or modify ue source code.
I am using UE to make and render animations, but we need to composite in fusion, nuke or some other.
Motion Vector is very common render pass. helps reproduce motion blur in composite software, World position helps relight or reproduce 3d point cloud informations.
Custom stencil seems like objID pass, and needs to remove numbers while exporting openexr.
So please take these passes into account if is possible!! Thanks.