i wonder why no one has requested that before.. sure that's easy enough to do.
though note that another way to look at your request is to say that you can just ignore the title field (and event hide it from display if you like), and just look at the excerpt field, which you can show in quick paste menu and show in the grid, etc.
so i'm happy to add it, but if you are desperate for it, might it be the case that you aren't sure how to have the excerpt column do the job you want it to do?