You are right on the fuel dumping, Mark, only one side is fully drained, regardless of the settings on the fuel dump panel.
A thing to fix, huh?
I've put it on the list.  :-/

Crashbar, I've mixed up the numbers of the tanks in this line. See the correct ones here and also above (I've edited the post).
The 707 runs seven tanks, Center, Left/Right Main (=2&3), Left/Right (=1&4) and Left/Right Tip (="Reserve").