A useful utility is Ubuntu Tweak:
http://www.getdeb.net/search.php?keywords=tweak

I am not sure that it can do what want but it is useful. Getdeb is a good
site for things not found in the repositories. Just make sure that you
download the right version 9.04 and 32 or 64-bit. You select the version
right above the list of applications. Download the deb and click on it to
open it in the package manager.