Is it possible to add dropEffect property to onMoveNode callback

React Dnd library supports different dropEffects "copy" and "move" which are switched when user press 'Alt' key. By using custom node renderer I am able to enable it, but then I don't have this parameter in callback.
In `react-sortable-tree.js` it is defined `endDrag` handler and there I see `dropEffect` with proper value in passed parameters, but it is somehow deleted and not passed to `moveNode` function which executes callback.
So far I feel that I dive enough into this to make custom pull request, but I currently I am stuck and can't figure out why dropEffect is not passed to moveNode function.