DOP = extend region. how does it work ?

Hi,

i select a region and apply DOP process.
Later i want to extend that region. Is there a way that on region size change the DOP auto apply process to new size ? i always end up having to cut process, reapply process after region change.
should i set extended process 10sec to cover this ?
you never really know. i have a reconformation of a movie i had no idea some extensions would be made here. i would prefer to have DOP recalculate process on each region size change rather then anticipating extended process size.

how does that work ?