Thanks for your replies.
Like you say, it’s there and you make use of it. All my departures this game were 9L@T and this was the only occurrence of the issue. I usually play KPHL starting at 06:00 if I am playing this airport and use 9R, 9L and 9L@T for departures at the same time to make aircraft movements more efficient, mixing up departure vectors etc to squeeze departures together. I appreciate - game behaviour, not real life. Even with arriving aircraft to contend with I have never experienced this issue before at KPHL.
The contact was full on; DAL194 was well onto the runway. Is it feasible for me to change the behaviour of the game in this regard to facilitate intersection departures in this manner? Is there an intention to alter the game engine mechanics to facilitate this? Or am I better off getting into the habit of having the departing aircraft taxi all the way to 9L or 9L@K5?
Thanks again.