Even if it's possible to make the exact amount with the current token combinations, it still ends up using just the tokens I have on hand, which can result in multiple inputs—like sending 256 using ...
It would be an additional network trip, but also very likely to incur swap fees. Wallets will try to optimise their proof database to make sure the denominations don’t result in huge tokens, but sometimes it’s unavoidable. For anything else there are animated QRs, which are pretty standard in Cashu enabled wallets