For the ini A310/A320-sent feedback to Asobo via the MSFS support ZenDesk about working them working with FSDT on a solution on seated passengers on these default planes that are encrypted plus Marketplace-only planes which are encrypted-and my feedback about this is logged internally for future plans by MS/Asobo.
As for the FSS E-Jets, seated passenger support is not yet planned according to FSS's Martin.