Warning for broken paths in Walkthrough

When working with Walkthroughs and reducing the number of scans the customer can see, it can easily happen that a Walkthrough path "breaks" when a required scan is removed.  The problem is, I don't know that the scan is required for the Walkthrough until I remove it.

The time required for trial and error adds up quickly, even when using "st=xx".  It would be very helpful if there were to be a Walkthrough path validation that would tell me if hiding a given scan position would break the Walkthrough.

Many thanks!