Additional setting in the client that will determine users native currency, UserA want to sell something at market and they list it as their expected paper currency, UserB opens client in different nation with different currency setting, client lists the price in UserB's native currency. Single website could host updated exchange rates and client could work from them. Items in the market are not listed in the blockchain, they are in a separate database hosted locally but also updated via P2P. This would be an easy method to integrate international sales and I personally think it would be attractive to the SYS community and beyond.
This is a pretty interesting concept. Though, in the moment the offers are not hosted on the blockchain, but need to be updated via p2p, why not directly have them on the chain where you have the payment process etc directly with it? It sounds like a bloating second chain besides the standard blockchain (at first glance, prob gotta re-think aboput this in the morning).
In general it is hard to have all currencies included in a hardcoded way into a wallet. Remember it is a load of maintenance to check the availability of the pages, data APIs and so on, and this in addition to all the other development.
We thought about it. It is basically "only" some API calls and basic calculations. But the maintenance is a killer at the moment - for us. We encourage projects like the actual USD converter to be enhanced and built upon by the community and interested vendors. Or someone picks this idea up and creates a page providing all this via API everyone could use.. many possible ways, but for us, besides the development and legal actions, not feasible _right now_.