I belive a mod to remove cap of party teammates would be great lore wise,
it would allow you to have all possible events and options that require certain characters at certain moments and places,
Not sure why one isn't made yet, it truly would be the greatest as many loved such ones when they were made for other similar games,
After all, not all of use have the option to replay the same game and same missions a thousand time to see all possible dialogues and events,
family & work at least are a barrier if someone feels that would be fun.