I think it would be a neat feature to be able to post more complex trade offers which might help bring up volume in some rare (crypto)currencies.
One could select that they for instance sell bitcoin for Euros (via SEPA payment), than they would select that they sells THAT SAME BITCOIN for british pounds (via bank transfer). And maybe they wouldn’t mind exchanging their bitcoin for some other cryptocurrency or whatever as well.
This could encourage posting trade offers in national currencies which could result in faster and cheaper transfers between banks. At the same time, imho, i don’t believe this should be so hard to implement, because even now Bisq checks if the offer is still available before the user is allowed to take the offer.