in the register, entering a transaction,
when i forget to enter a transfer account,
gnucash presents popup "Rebalance Transaction" offering 3 choices:
   ( ) Balance it manually
   ( ) Let GnuCash add an adjusting split
   (*) Adjust current account split total

already, this could be better, more like "you didn't enter a transfer
account".  but it gets worse.  i cancel the popup, and enter a transfer
account.  then gnucash again presents popup "Rebalance Transaction" now
offering 4 choices:
   ( ) Balance it manually
   ( ) Let GnuCash add an adjusting split
   (*) Adjust current account split total
   ( ) Adjust other account split total

at the very least, the default is wrong, "adjust other account" would be
the right thing to do.  but really, it should do that without even asking,
like as if i had not forgotten the transfer account in the first place.