I use the manual tool a lot, since faces often get "skewed" especially when there are difficult light conditions.
However it is not so intuitive, and also the behaviour when shrinking / enlarging/ moving the selection box is farely difficult to understand.
I believe a new tool is under testing... let's see what happens. I really would like some freedom here, like manually adjusting the position of the landmarks, masking, maybe some filtering and basically "forcing" a face recognition even in a difficult situation.
let's see what happens...
However yes, you are right!
Whenever you correct an alignment both the original face and the relative mask are lost: a second extraction is necessary AND a re-masking operation is needed.... however the extraction is faster, since you tell the SW exatly where to look at.