Jon,
Each time I add a reference to the database from the Internet Search window, I have to click on the "Copy To" button and then select my database. However, I usually work with only one database open. Why not just add a right-click menu that lists the open databases and say, Add to x database. This just allows me to keep my cursor near the reference I'm working on as opposed to scrolling down to the button at the bottom of the page.
Small thing, but I would find it useful, and I'm sure others would too.