I would like that the cursor assumed a form in accordance with the selection method, if entity, if group, if area and if fence at the moment. It would be a visual idea, that would prevent confusion between the selections. For example, the selection for area would have a small rectangle in the center of the cursor, fence, small fence in the center of the cursor.
I agree, perhaps a sound (tone/beep), voice option that could be set to come on and state "group". It could even say "Stretch - by Group". I really like the line of thinking.....
I like the idea that I can take action without having to scan the screen so much. Maybe the length & direction too.