Please add a ruler enhancement. Please have the ruler go from one point to another. This can either be by GlobalNodeId or two selected points, your choice. Have the ruler optionally, default on, displace by the Displacement variable over time. Finally, this needs to be something that can be seen in the spreadsheet, and written to a file.
If short term the answer is a programmable filter, please write this up in the Discourse Tips and Tricks.