I fixed the Pawn move in the Diagram, and added Prince to the promoChoice. (Now indicated by the letter M to distinguish it from Pawn.)
I think promotion to Prince is an improvement, because 2M vs N or 2M vs M are general wins (when stalemate is a win), while any other combination of two pieces cannot beat a lone N or M. So the advantage of a single Pawn can now be enough to force a win. And a lone K is already enough to beat a lone desert piece. So this should remove most of the drawishness, if there ever was any.
I fixed the Pawn move in the Diagram, and added Prince to the promoChoice. (Now indicated by the letter M to distinguish it from Pawn.)
I think promotion to Prince is an improvement, because 2M vs N or 2M vs M are general wins (when stalemate is a win), while any other combination of two pieces cannot beat a lone N or M. So the advantage of a single Pawn can now be enough to force a win. And a lone K is already enough to beat a lone desert piece. So this should remove most of the drawishness, if there ever was any.