Is your feature request related to a problem? Please describe.

Hopefully just to improve ux. When selecting several lines of text you might want to quickly check where your selection starts. This is now possible with "announce current selection" but may require several key presses.

Describe the solution you'd like

This should be easy by setting review position to start/end of selection. I think it would be consistent to have both selection start/end gestures.

Describe alternatives you've considered

Additional context