  Neutral atoms can strongly influence the intrinsic rotation and radial
electric field at the tokamak edge. Here, we present a framework to investigate
these effects when the neutrals dominate the momentum transport. We explore the
parameter space numerically, using highly flexible model geometries and a state
of the art kinetic solver. We find that the most important parameters
controlling the toroidal rotation and electric field are the major radius where
the neutrals are localized and the plasma collisionality. This offers a means
to influence the rotation and electric field by, for example, varying the
radial position of the X-point to change the major radius of the neutral peak.
