Hi,
Thanks for trying DTI-TK. Although there is no ability to pick a voxel and get its x and y coordinates, you can scroll through the volume and get the slice number. The key strokes to advance the slices are described in the relevant page:
The slice number should be reported in the title of the rendering window.
I like your idea to make the tool more useful. I will see if I can implement this functionality.
Gary Z