I'm guessing that the rule about not using the accusative -n with Esti does not apply when esti is an auxiliary verb.
"Esti" can't have an object but participles can.
Ah yes. That seems vaguely familiar--I think.
Am I correct in guessing that I can in principle write
"estos skribinta" as "skribintos"? (as adjectives can do)
Such plasticity would really blow my mind!
I believe so, judging from previous comments - I'm no expert, though!