1) in combo menu, option with dropdown menu does the bend is starting from the edge of sheet metal or is offset from this edge or the bend is ended on original boundaries. Hopefull this is understandable

2) unfold is working but there should be option to bend again. It is necessary when you want to put cutout on the bending. Is it possible to bend it again.
3) this would be really enhacement. To create sheetmetal form solid. For example you are putting box. You are going to sheetmetal and choosing option "create sheet metal form solid". Then you should choose solid box and this should works more or less like shell, to choose wall thickness, optional to remove selectioned surface, choose the ripped edges, choose the bend edges. After that this should solve it, and should be possibility of unfolding and folding again.
What do you think? Is this possible?