Digging in, a TOAW III "improvement" ?

[Currahee]

OK, I've reported it; first I tested a bit, and it's clear that sometimes units set on "D" will dig in to a higher level, sometimes directly to "F"; however, they don't seem to do so as quickly or as reliably, as when done manually. I've asked that that be fixed, to avoid the tedium of having to dig units in each turn.