I am using the UI-O-Matic extension with a Content Picker as field editor. I want to change the start node that opens when the user selects the picker. So far I've found this code, where it might be possible to make this change:

$scope.openContentPicker = function () {
                var d = dialogService.treePicker({

                    section: "content",
                    treeAlias: "content",
                    multiPicker: false,
                    callback: populate
                });
            };

            $scope.model.config.StartNodeId = 1083;
            if ($scope.model.config.StartNodeId) {
                options.startNodeId = $scope.model.config.StartNodeId;
            }

I want the start ID to be 1083, and I have changed it as so in the code, but it still defaults to my root node.

How can I change the start node id correctly?