We have had same problem, creating a starpoint in a circuit.
How we do it is create your resistor in the standard way (size you want), but for the padstacks ensure that they have no solderpaste or soldermask defined.
This will mean that the final result the part is buried under soldermask on the final pcb.
We then create two conductive shapes which are assigned the net of each pad and they then overlap the pad and then each other in the middle of the device.
One thing you may want to consider is on this new cell created put some form of symbol on the silkscreen, so that when you view the finished pcbs it is easy to see why it appears that a resistor has been covered in soldermask.
Attached is couple of pictures from our part to illustrate above.