Extending on your suggestion 2:
It's difficult for members to know whether they should post in coin identification request or exonumia identification when they have no idea yet what their piece of metal actually is.
I would recommend keeping only 2 identification sections: “Coins, tokens, and medals identifications and valuations” and “Banknotes and paper exonumia identifications and valuations”.
Also, many requests for the catalogue actually impact all categories: requests related to issuers, currencies, rulers, etc.
I would recommend keeping only 1 section “Numista catalogue”.
I'm not sure whether we should keep the split between coins, banknotes and exonumia either for the sections “information and questions” and “swaps”. Especially for exonumia: there is little in common between a transportation token and a postal order.
Perhaps we could review the overall structure Coins/Banknotes/Exonumia/General into: “Coins, tokens and medals”, “Banknotes and paper exonumia” and “General”. Then we can decide whether we want a joined section for swaps of coins, tokens and medals or have separate sections within the group.