Most people have said that any helper bar does not improve indexing. I have found at one point I was typing the URL into a bar and right away the bot visited that page. Maybe it was just a coincidence.
I do know Google will index you quicker - I was setting up a forum site the other day, which no one could possible know of or have access too. It was live for all of 10 minutes. But, as I set it up I noticed it said "3 users online". One was myself, and upon investigation, the other two were bots from Google! Pretty quick.
If the AV bar does the same thing, maybe it's worth a download ;)