Hi,
There is way for this.
In the Telemetry click mouse primary button at the start of the "mini sector", then press mouse secondary button at the end of the "mini sector". The tool will zoom into that section and the TimeDiff starts at 0 from the start of the mini sector. (This also works in the multilap view.)
See this image
View attachment 506711
This way you have full control of the area, which you are looking at, as you can the drag the traces or use mouse scroll to zoom in/out. And the minimap will show the area, which you are looking at + the "main map" shows the start and end points (if you have the option turned on in the main map, and there you can see the driven lines too to see the difference in lines taken.
I could add the mini sectors to the Tool, but it is on a very low priority, as you can get the same (and to my opinion) better functionality, when you do the selection with the mouse clicks. This way you can move around as the interesting bits might be
Cheers.