I make a alot of shops in my single player worlds, and its hard to fit every trade I need into one NPC - whether its ores or flowers or anything else.

While it isn't a major problem, trades are currently limited to only 12 - I'd like an option to add more trades (maybe to a configurable limit.) Additionally the option to mark a specific trade as reversible (being able to buy AND sell in the same trade for the same items.) Ex: 1 Coal for 1 Charcoal, but it can be used both ways. This would help declutter trades and reduce the amount of needed trading NPCs since all the trades you need for one shop could be in the same trader.

The way to add more space can be through trade "pages," where each page has 12 trades. That way its not a set number of trades but a number of pages - it might make it easier to sort through as well hopefully.

EDIT: I realize reversing trades might not be super easy - and it's perfectly fine if it won't be attempted! Mostly I think more trades would be best. :)

If you do advanced trade I believe it goes up to 25

Ah yes that's true! But I like having the option to sell materials as well, so my trades fill up really quick :(

I don't know if it would be possible too, but I think it would be nice if we could make multiple trades with a single NPC. For example, when you open a trade normally, you would see one kind of trade, but if you open the trade after fulfilling certain requirements, you would get another set of trades.