When I use the key combination Ctrl-Alt-Shift-[ to add a new index entry, I can't immediately tell if it worked. I have to scroll to the right spot in the index preview and drill down through the alphabet and layers of headings and subheadings to find the new entry and see that it looks as expected.

This really slows me down. I find myself doing this over and over again. And I have to do, it, because if for some reason the key combo didn't work (say, because one of the keys wasn't depressed enough) and I didn't notice, it would be even worse to go back to the right spot later and add it.

I think that as soon as I make a new index entry, the index panel should show it to me in the index preview.