I realize that the full game leaderboards aren’t really active here, however I think adding more categories like “A tall tale” or rules like “New Game - All S rank” alongside “A tale for two” adding “new game +” and “new game - all medals would make great additions. Does anyone else have oppinions on adding these? What is the process for adding these?

it would be really cool to see them

I think that the categories are fine, but they aren't worth adding unless someone does a run for them. Otherwise the categories will all be empty. The game isn't very active in the first place anyways. If you do a run of them, message the moderators and ask them to add the category and they might add it.