It seems to me that 3 solutions are proposed so far: 1. instead of a single output, break up the change output into multiple outputs of small amounts 2. allow user to specify multiple destination addresses in a single transaction 3. allow using unconfirmed outputs

3. is unsafe, as discussed above

1. only solves the problem partially -- it is still a problem when one spends the first funding transaction followed by creating another transaction immediately. In addition, setting the small amount threshold is a guessing work -- if the threshold is too big as relative to what the user normally keeps & spends, the same problem still exists. If it is too small user will end up paying additional fees because of the transaction size. I thought of this solution before, but in the end I thought to myself this would be the classic case of "software trying to be smart but ends up screwing with you and makes you hate technology"

Solution 2. seems like the only sensible solution to me, but it sure has UX implications for Hive (advanced send?). It does address OP's particular use case if he knows in advance that he wants to send x amount to addr1 and y amount to addr2, and decides to do it in a single transaction. Also it doesn't really address the "send one transaction followed by another" problem.

Keep the ideas coming. If we end up coming up with a good solution, I'm happy to implement it