Ian, actually not "opposite".

If they will make mechanism "freeze selected bars" I am sure there will be "unfreeze selected" as well. So your scenario only 2 clicks away.

1) Freeze All
2) Unfreeze selected

In this case, that "unfrozen" selection/section should it theory do what you are requesting...and me too. ... To generate only "unfrozen" sections, without loosing all other stuff and at faster time smile