No, I don't know. Please, do explain.
The modes are simply filters for level of player interaction. In solo, there is no player interaction. Hence why player wings and multi-crew would not be available. Also why some have asked for NPC wings and multi-crew as an added feature. One that could be available in other modes.
In PG, there is user selected player interaction. Hence why player wings and multi-crew between commanders belonging to the same group would be available.
In Open, there is user selected and non selected player interactions. Hence why player wings and multi-crew between consenting commanders would be available.
PP is game content that requires no other player interactions for individual participation. Hence, it has been available from the beginning across all modes.
Wings and multi-crew require multiplayer interactions for the game feature. PP does not require multiplayer interactions for that game content.
I hope this helps.