Until A 6.* you could shape a layer in a way I can't do now
Under Layer / Rotate and Transform you could select.. I forget the name a way that you could adjust a rectangle in a NON-proportional way.
I.e. you could bring the sides in, but the top and bottom would remain the same.
Is there a way to adjust a layer like that now? I have tried holding the shift, and other keys down, with no luck