I aggree on that your suggestion is rather conveient way in user point of view.
However one more thing is still not clear to me to decide easy and best way.

Is the reduced B-field(or Half B-field) now officially adapted by all tracking group and analysis group? If yes, "Full" have to use automatically reduced field at below 3 GeV as you suggested, but I didn't hear any conclusion about it.
Quote:

For less than 3GeV it has to be half and above the full.