I often find myself removing links – typically when I duplicate a mockup. I remove the links so that the flow doesn’t “break” when I am presenting a simple linear prototype.
I really like that “no link” is always available at the bottom of the Links section in the Inspector. However, it would reduce the interaction cost even further if this option was available via right-click.
It would also make it quicker to remove a bunch of links at once. See: How to remove all links from a mockup?