The new Porsche 911 GT3 RS 2010 from the GT10_1 pack completely drives like a fwd. Is this normal ?

Anyone ?
The car looks and sounds so good, it's so bad it drives like a Clio...

The handbrake also works, which makes me believe something isn't right(maybe the car is not 'reversed'  ? )

As far as I know this car is AWD, using the standard physics.
So it has 3 active differentials, which you could verify by opening the respective setup dialogs within RBR.
Basically a Xsara, looking like a Porsche.

If you want to drive the real thing, you would have to use the current NGP, which by the way is 5.0.1.
Unfortunately RSRBR still uses a very outdated version of NGP.