Blimey! I didn't know that . . .D'yer know what BB? If you have selected a range, and click on say the second little window and reduce the values, say by 1 second, your selection moves down the t/l by one second - this is very useful indeed.
Similarly, you can copy/paste times into this "Cursor Position" box.
This is useful to make up for what I regard as a missing feature - the absence of the ability to select an item in the Edit Details window and choose to jump to its location (like you can from the Markers/Regions lists in Sound Forge). But you can copy the relevant time from the Edit Details window and then paste it into the Cursor Position box which achieves the same thing in a rather more roundabout way.
Let's hope when V5 arrives it will have a neater method for doing this - perhaps a right-click Goto option from the Edit Details window -but until then the copy/paste method can be used.