Photoshop :: Maintain A Fixed Radius Of Rounded Corners During Transform?

i'm trying to design a layout using slices and such for a website. i'm using the vector objects and layer styles inside Photoshop CS4.

Problem is that during resize, all rounded corners get distorted and do not maintain shape or radius, is there a way to prevent rounded corners from distorting during transform?

otherwise this seems way too tedious to be an effective method of creating a layout that may need adjustments later, since things will need to be recreated.

I'm used to working with parametric CAD (inventor/solidworks), so i'm like a fish out of water without geometric constraints or ability to re-spec existing objects without remaking them...takes me back to the days of autocad.