Here's a scenario you could do with this - preview edit.
You'd need to have two markers set up in advance - say marker 1 is set to "jump to marker 2" and marker 3 is set to "jump to marker 4".
You put marker 1 at the point where the existing material is to be replaced by other existing material. You put marker 2 where that material starts. You put marker 3 where that replacement material ends. You put marker 4 where you want to continue with the original material.
Play from before marker 1, and when it gets to the duff bit, it jumps to the replacement good bit, then at the end of the replacement good bit, it goes back to the original material.
A custom action would place markers 1 and 4 either side of a selection you create to delimit the duff bit. Another custom action would place markers 2 and 3 either side of a selection you create to delimit the replacement bit, and at once go to marker 1, rewind three seconds, and play. That would audition the edit via the "jumping markers". The same custom action would have a "prompt to continue" action, and when you confirmed that after having heard the preview, the edit would be performed (I've already got custom actions that do that), or if you pressed cancel, nothing further would happen.
Two custom actions required to do the whole preview and execute edit operation. Magic.
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