I guess one important UX thing to do in regards to cashu/ecash is the ability to view the lightning connections a mint has if possible, of the ecash received, and a search field to see if there's a path to send to a different lighting wallet, and a quick calculation option to see what can be possibly sent out to the desired destination (all of this is to decrease the guesswork for a user to know if they can get their money out of the minter and to know what amount they can send out so they don't do multiple failed attempts at sending, and would be a safety mechanism to know if you can even get the mint out so you don't get scammed).