As you may know each BTC transaction as a disastrous C02 foot. For that purpose i’d like to trade more ecofriendly altcoins directly by using fiats. Is that possible? And if not, are you considering doing anything about it? How bisq gets involve in being environmental responsible?
A nice eco-friendly alternative is http://www.burstcoin.org/, it is based on proof of capacity (hard disk space). This coin has a built-in escrow with multi-signature/etc. It is apparently well suited as a base currency for bisq.
I am not sure if XMR supports multisigs, as they are a requirement for being a base currency.
Eitherway it requires a bit of a development effort to add a coin as a base currency as the whole trade needs to run over it. This was easy for LTC as it is very much like BTC and I think that Dash community helped about adding them.
Even Ethereum is not implemented as a base currency yet, so I doubt that other altcoins will be used without being quite popular. It is not easy to implement a coin as a base currency in Bisq.