Vasco, that is not what you said, you indicated that the crew could not move the bkt by any means, reread your post! What is the ideal position, surely that depends on a whole manner of things, AP Airfields, Weather, Land Masses, ATC, the list goes on. The MPS cannot account for all of these and so has an automatic function that positions the bkt, I believe (although without looking at it again I can't remember atm) in the latest possible position, and then allows the crews to alter as required through the manual planning facility. It is not always best to fill to full either, if you think of the Tonka, which has to use burner when approaching full, the most fuel efficient way of planning the trail is to partial transfer on the final bkt to negate the need to plug in the burner, it also gives you more options should you have a trapped fuel issue.