The 51D already has the AUX in top priority for the automatic tank order, whereas other planes with just as auxiliary and CG spoiling AUX tanks don't.
So I ask HT if we'd maybe get a separate wing tanks or aux or whatever-option to fill each of them separately before taking off, and he answered that "it isn't as simple as you envision".
So it probably is.
But it'd be nice to be able to write our own .txt .cfg or whatever, to choose the timing and selection of the automatic tank switcher.