This command controls indifferent preference arbitration. When an indifferent preference tie is created among two or more items, then the "user-select" parameter is used by the Soar decision procedure to control the selection of one item to resolve the tie and avoid an impasse.
If no option is given, this command prints the current setting of the "user-select" parameter. If an option is given, it is used to guide the resolution of indifferent preference ties. At startup, the default setting of the "user-select" parameter is -first.