[Taera]

I surely hope but doubtfully.
STILL

YOU can create the function using the very same sentry command. Have a ship sitting with sentry order. Have another ship of another empire heading to the system, count the requied turns and send it to the system the way it would reach in exactly when you need it. THen have it enter a minefield which you also should plant in the same system. This way the target ship(s) will be triggered in time and the triggering empire will be erased.