Disappointing Rated 2 out of 5 stars
If there was a way to customize which search engines are available I couldn't find it. I searched high and low too since I couldn't believe that option would be excluded.
I hope a future release will allow this feature. And if it does, I hope it will include the other Google databases currently not accessible without re-searching (books, scholar, news archives etc.)
It's hard to believe Google doesn't offer a custom tab feature. I would gladly pay if this mod filled the gap.