I'm not a heavy sheetmetal designer, but most of the properties are set under the sheet metal styles dialog box (material properties, bend radius, K factor, relief shape, width, all that good stuff), and you can over-ride them when you make a face. When you make a bend it will give you options for the location of the bend (sketch line in center or on either end of the bend) and you can re-set the radius of that bend when placed. Of course you can go in and edit afterwards if you like too.
It has problems if you are trying to make a bend that is going to intersect with another part, which has been frustrating for me, but I'm coping.