Steaming does help. Dry cleaners used to have a mannequin shaped device that steamed everything before the pressers finished it.
The little home steamers are made to use gravity. Unless you can keep quilt backing taut on frame and roll it, it probably wouldn't do too much good.
I had a steamer when kids were here. They hated to iron, and I wouldn't do it, so they used the steamer and either a coat hanger for the garment or one of the sewing mannequins. The weight of the garment at the hem helps smooth the garment.