Roger Standby,
Totally agree, wait a little and if track shortening isnt forcoming then ask for it,
Just like when given a time to pass a waypoint and so and so comes back and says "best time we can do is ?? We will need some vectors." Well you may need vectors or you may need a new route or you may need to enter a hold! Just give them the best time you can do and let them do their job!, the less talk the better, thats common courtesy too