Are the 600's fuel booster pumps still switched on manually WITH NO WARNING IN T/O CONFIG?
Yes they are selected on manually, the are selected on in preliminary cockpit preparation, and are left on until performing the leaving aircraft checklist.
They are not covered by Takeoff Config Warning, why should they be?
Leaving them OFF with an engine running will give you an FUEL FEED LO PRESS caution right away.
There in an post engine start FWS recall, that will reveal the omission, as well as a pre-take off flight deck visual scan, that is good airmanship.