Play with the skins, that's what we are doing. We have completely branded the top bar and are editing the CSS and images to match it. You should be able to change the page title there too.
No problem changing the images and color but I couldnt find a way to take the Plesk out of the title bar. If you open the .php pages in any editor it has been encoded, If I add any code to the page if gives errors, The page "Title" is in the encoded code.