Hmm.... Needs testing. I am not sure the entrench_ext supports it, as I have never tried it - normally it must, but one can never know.
Even if the AE does not support it, SCaR most possibly does. And since all landing flyers MUST use SCaR (because of the stuck issue), I cannot remotely see any good reason why not.
Why, do we have a unit that has that behaviour?
If yes, I can experiment