Nope. Unfortunately.
There are several properties that would be nice to set in IB. Sometimes Apple adds them, and then IB warns you that it is "only supported on iPhone OS 3.0 and higher" or similar (I think this applies to contentEdgeInsets in some class or other).
, XML, (, - NSStringFromCGAffineTransform), , , Apple .
, xib, -[UIView initWithCoder:] . InterfaceBuilder , IB...